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INTEGRATED CIRCUITS
80C31X2/32X2 80C51X2/52X2/54X2/58X2 87C51X2/52X2/54X2/58X2 80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP 128B/256B RAM low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
Preliminary data 2001 Sep 24
Philips Semiconductors
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
DESCRIPTION
The Philips microcontrollers described in this data sheet are high-performance static 80C51 designs incorporating Philips' high-density CMOS technology with operation from 2.7 V to 5.5 V. They support both 6-clock and 12-clock operation. The 8xC31X2/51X2 and 8xC32X2/52X2/54X2/58X2 contain 128 byte RAM and 256 byte RAM respectively, 32 I/O lines, three 16-bit counter/timers, a six-source, four-priority level nested interrupt structure, a serial I/O port for either multi-processor communications, I/O expansion or full duplex UART, and on-chip oscillator and clock circuits. In addition, the devices are low power static designs which offer a wide range of operating frequencies down to zero. Two software
Type Memory
# of Timers
selectable modes of power reduction -- idle mode and power-down mode -- are available. The idle mode freezes the CPU while allowing the RAM, timers, serial port, and interrupt system to continue functioning. The power-down mode saves the RAM contents but freezes the oscillator, causing all other chip functions to be inoperative. Since the design is static, the clock can be stopped without loss of user data. Then the execution can be resumed from the point the clock was stopped.
SELECTION TABLE
For applications requiring more ROM and RAM, as well as more on-chip peripherals, see the P89C66x and P89C51Rx2 data sheets.
Timers
Serial Interfaces
Default Clock Rate ADC bits/ch. Optional Clock Rate Max. Freq. at 6-clk / 12-clk (MHz) 30/33 30/33 30/33 30/33 30/33 30/33 30/33 30/33 30/33 30/33 Freq. Range at 3V (MHz) 0-16 0-16 0-16 0-16 0-16 0-16 0-16 0-16 0-16 0-16 Freq. Range at 5V (MHz) 0-30/33 0-30/33 0-30/33 0-30/33 0-30/33 0-30/33 0-30/33 0-30/33 0-30/33 0-30/33
Interrupts (External) 6 (2) 6 (2) 6 (2) 6 (2) 6 (2) 6 (2) 6 (2) 6 (2) 6 (2) 6 (2)
P87C58X2 P80C58X2 P87C54X2 P80C54X2 P87C52X2 P80C52X2 P87C51X2 P80C51X2 P80C32X2 P80C31X2
256B 256B 256B 256B 256B 256B 128B 128B 256B 128B
- 32K - 16K - 8K - 4K - -
32K - 16K - 8K - 4K - - -
- - - - - - - - - -
3 3 3 3 3 3 3 3 3 3
- - - - - - - - - -
- - - - - - - - - -
- - - - - - - - - -
n n n n n n n n n n
- - - - - - - - - -
- - - - - - - - - -
- - - - - - - - - -
- - - - - - - - - -
32 32 32 32 32 32 32 32 32 32
Program Security n n n n n n n n - -
I/O Pins
UART
Flash
PWM
ROM
RAM
CAN
OTP
PCA
WD
I 2C
SPI
12-clk 12-clk 12-clk 12-clk 12-clk 12-clk 12-clk 12-clk 12-clk 12-clk
6-clk 6-clk 6-clk 6-clk 6-clk 6-clk 6-clk 6-clk 6-clk 6-clk
NOTE: 1. I2C = Inter-Integrated Circuit Bus; CAN = Controller Area Network; SPI = Serial Peripheral Interface; PCA = Programmable Counter Array; ADC = Analog-to-Digital Converter; PWM = Pulse Width Modulation
2001 Sep 24
2
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
* PLCC or DIP package (LQFP available soon) * Extended temperature ranges * Dual Data Pointers * Security bits:
- ROM (2 bits) - OTP (3 bits)
FEATURES
* 80C51 Central Processing Unit
- 4 kbytes ROM/EPROM (80/87C51X2) - 8 kbytes ROM/EPROM (80/87C52X2) - 16 kbytes ROM/EPROM (80/87C54X2) - 32 kbytes ROM/EPROM (80/87C58X2) - 128 byte RAM (80/87C51X2 and 80C31X2) - 256 byte RAM (80/87C52/54X2/58X2 and 80C32X2) - Boolean processor - Fully static operation - Low voltage (2.7 V to 5.5 V at 16 MHz) operation
* 12-clock operation with selectable 6-clock operation * Memory addressing capability
- 64 kbytes ROM and 64 kbytes RAM
* Encryption array - 64 bytes * 4 interrupt priority levels * 6 interrupt sources * Four 8-bit I/O ports * Full-duplex enhanced UART
- Framing error detection - Automatic address recognition
* Power control modes:
- Clock can be stopped and resumed - Idle mode - Power-down mode
* Three 16-bit timers/counters T0, T1 (standard 80C51) and
additional T2 (capture and compare)
* CMOS and TTL compatible * Two speed ranges at VCC = 5 V
- 0 to 30 MHz with 6-clock operation - 0 to 33 MHz with 12-clock operation
* Programmable clock-out * Asynchronous port reset * Low EMI (inhibit ALE, slew rate controlled outputs, and 6-clock
mode)
* Wake-up from Power Down by an external interrupt.
2001 Sep 24
3
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
80C31/32X2 ORDERING INFORMATION (ROMLESS)
Type number Package Name PLCC44 DIP40 PLCC44 DIP40 PLCC44 DIP40 Description plastic leaded chip carrier; 44 leads plastic dual in-line package; 40 leads (600 mil) plastic leaded chip carrier; 44 leads plastic dual in-line package; 40 leads (600 mil) plastic leaded chip carrier; 44 leads plastic dual in-line package; 40 leads (600 mil) Version SOT187-2 SOT129-1 SOT187-2 SOT129-1 SOT187-2 SOT129-1 Temperature Range (C) R 0 to +70 0 to +70 0 to +70 0 to +70 -40 to +85 -40 to +85
P80C31X2BA P80C32X2BA P80C32X2FA
P80C31X2BN P80C32X2BN P80C32X2FN
87C51X2 ORDERING INFORMATION (4 KBYTE OTP ROM)
Type number P87C51X2BA P87C51X2BN P87C51X2FA Package Name PLCC44 DIP40 PLCC44 Description plastic leaded chip carrier; 44 leads plastic dual in-line package; 40 leads (600 mil) plastic leaded chip carrier; 44 leads
87C52X2 ORDERING INFORMATION (8 KBYTE OTP ROM)
Type number P87C52X2BA P87C52X2BN P87C52X2FA P87C52X2FN Package Name PLCC44 DIP40 PLCC44 DIP40 Description plastic leaded chip carrier; 44 leads plastic dual in-line package; 40 leads (600 mil) plastic leaded chip carrier; 44 leads plastic dual in-line package; 40 leads (600 mil) Version SOT187-2 SOT129-1 SOT187-2 SOT129-1 Temperature Range (C) R 0 to +70 0 to +70 -40 to +85 -40 to +85
80C54X2 ORDERING INFORMATION (16 KBYTE ROM)
Type number P80C54X2BA P80C54X2FA Package Name Description Version PLCC44 PLCC44 plastic lead chip carrier; 44 leads plastic lead chip carrier; 44 leads SOT187-2 SOT187-2 Temperature Range (C) R 0 to +70
AAAAA AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA AAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAA AA AA AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAA A AAAAA AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA AAAAA AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AA AA AAAAA AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA AAAAAAAAA AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAA AA
87C54X2 ORDERING INFORMATION (16 KBYTE OTP)
Type number P87C54X2BA P87C54X2FA Package Name PLCC44 DIP40 PLCC44 Description
plastic lead chip carrier; 44 leads plastic lead chip carrier; 44 leads
P87C54X2BN
plastic dual in-line package; 40 leads (600 mil)
87C58X2 ORDERING INFORMATION (32 KBYTE OTP)
Type number P87C58X2BA P87C58X2FA Package Name PLCC44 DIP40 PLCC44 Description
plastic lead chip carrier; 44 leads plastic lead chip carrier; 44 leads
P87C58X2BN
plastic dual in-line package; 40 leads (600 mil)
2001 Sep 24
4
AAAAA AAAAA AAAAA AAAAA AAAAA AAAAA AAAAA AAAAA AAAAA AAAAA AAAAA
Version SOT187-2 SOT129-1 SOT187-2 Version SOT187-2 SOT129-1 SOT187-2 Version SOT187-2 SOT129-1 SOT187-2
AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA
Temperature R Range (C) 0 to +70 0 to +70 -40 to +85
-40 to +85
Temperature Range (C) R 0 to +70 0 to +70
-40 to +85
Temperature R Range (C) 0 to +70 0 to +70
-40 to +85
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
PART NUMBER DERIVATION
Memory P87C51X2 7 = OTP 0 = ROM or ROMless
5 = ROM/OTP 3 = ROMless
Temperature Range B = 0 C TO +70 C F = -40 C TO +85 C 1 = 128 BYTES RAM 4 KBYTES ROM/OTP 2 = 256 BYTES RAM 8 KBYTES ROM/OTP 4 = 256 BYTES RAM 16 KBYTES ROM/OTP 8 = 256 BYTES RAM 32 KBYTES ROM/OTP
Package A = PLCC N = DIP
The following table illustrates the correlation between operating mode, power supply and maximum external clock frequency: Operating Mode 6-clock 6-clock 12-clock 12-clock Power Supply 5 V 10% 2.7 V to 5.5 V 5 V 10% 2.7 V to 5.5 V Maximum Clock Frequency 30 MHz 16 MHz 33 MHz 16 MHz
2001 Sep 24
5
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
BLOCK DIAGRAM 1
Accelerated 80C51 CPU (12-clk mode, 6-clk mode)
0K / 4K / 8K / 16K / 32K Byte CODE ROM / EPROM Full-duplex enhanced UART 128 / 256 Byte Data RAM Timer 0 Timer 1 Port 3 Configurable I/Os Timer 2 Port 2 Configurable I/Os
Port 1 Configurable I/Os
Port 0 Configurable I/Os
Crystal or Resonator
Oscillator
su01579
2001 Sep 24
6
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
BLOCK DIAGRAM 2 (CPU-ORIENTED)
P0.0-P0.7 P2.0-P2.7
PORT 0 DRIVERS VCC VSS RAM ADDR REGISTER RAM PORT 0 LATCH
PORT 2 DRIVERS
PORT 2 LATCH
ROM/EPROM
8 B REGISTER STACK POINTER
ACC
TMP2
TMP1
PROGRAM ADDRESS REGISTER
ALU SFRs PSW TIMERS
BUFFER
PC INCREMENTER 8 PROGRAM COUNTER 16
PSEN ALE/PROG EA / VPP RST PD TIMING AND CONTROL
INSTRUCTION REGISTER
DPTR'S MULTIPLE
PORT 1 LATCH
PORT 3 LATCH
OSCILLATOR PORT 1 DRIVERS XTAL1 XTAL2 P1.0-P1.7 PORT 3 DRIVERS
P3.0-P3.7
SU00845
2001 Sep 24
7
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
LOGIC SYMBOL
VCC XTAL1 PORT 0 ADDRESS AND DATA BUS VSS
PLASTIC LEADED CHIP CARRIER PIN FUNCTIONS
6 1 40
7
39
PLCC
XTAL2 T2 T2EX RST EA/VPP PSEN SECONDARY FUNCTIONS ALE/PROG RxD TxD INT0 INT1 T0 T1 WR RD PORT 1 17 29
18 Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Function NIC* P1.0/T2 P1.1/T2EX P1.2 P1.3 P1.4 P1.5 P1.6 P1.7 RST P3.0/RxD NIC* P3.1/TxD P3.2/INT0 P3.3/INT1 Pin 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Function P3.4/T0 P3.5/T1 P3.6/WR P3.7/RD XTAL2 XTAL1 VSS NIC* P2.0/A8 P2.1/A9 P2.2/A10 P2.3/A11 P2.4/A12 P2.5/A13 P2.6/A14
28 Pin 31 32 33 34 35 36 37 38 39 40 41 42 43 44 Function P2.7/A15 PSEN ALE NIC* EA/VPP P0.7/AD7 P0.6/AD6 P0.5/AD5 P0.4/AD4 P0.3/AD3 P0.2/AD2 P0.1/AD1 P0.0/AD0 VCC
PORT 3
PORT 2
ADDRESS BUS
SU00830
PLASTIC DUAL IN-LINE PACKAGE PIN CONFIGURATIONS
T2/P1.0 1 T2EX/P1.1 2 P1.2 3 P1.3 4 P1.4 5 P1.5 6 P1.6 7 P1.7 8 RST 9 RxD/P3.0 10 TxD/P3.1 11 INT0/P3.2 12 INT1/P3.3 13 T0/P3.4 14 T1/P3.5 15 WR/P3.6 16 RD/P3.7 17 XTAL2 18 XTAL1 19 VSS 20 DUAL IN-LINE PACKAGE 40 VCC 39 P0.0/AD0
* NO INTERNAL CONNECTION
SU01062
LOW PROFILE QUAD FLAT PACK PIN FUNCTIONS (AVAILABLE SOON)
44 34
38 P0.1/AD1 37 P0.2/AD2 36 P0.3/AD3 35 P0.4/AD4 34 P0.5/AD5 33 P0.6/AD6 32 P0.7/AD7 31 EA/VPP 30 ALE 29 PSEN 28 P2.7/A15 27 P2.6/A14 26 P2.5/A13 25 P2.4/A12 24 P2.3/A11 23 P2.2/A10 22 P2.1/A9 21 P2.0/A8 * NO INTERNAL CONNECTION Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Function P1.5 P1.6 P1.7 RST P3.0/RxD NIC* P3.1/TxD P3.2/INT0 P3.3/INT1 P3.4/T0 P3.5/T1 P3.6/WR P3.7/RD XTAL2 XTAL1 12 Pin 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Function VSS NIC* P2.0/A8 P2.1/A9 P2.2/A10 P2.3/A11 P2.4/A12 P2.5/A13 P2.6/A14 P2.7/A15 PSEN ALE NIC* EA/VPP P0.7/AD7 22 Pin 31 32 33 34 35 36 37 38 39 40 41 42 43 44 Function P0.6/AD6 P0.5/AD5 P0.4/AD4 P0.3/AD3 P0.2/AD2 P0.1/AD1 P0.0/AD0 VCC NIC* P1.0/T2 P1.1/T2EX P1.2 P1.3 P1.4 11 23 1 33
LQFP
SU01487
SU01063
2001 Sep 24
8
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
PIN DESCRIPTIONS
PIN NUMBER MNEMONIC DIP VSS 20 VCC 40 P0.0-0.7 39-32 PLCC 22 44 43-36 LQFP 16 38 37-30 TYPE I I I/O NAME AND FUNCTION Ground: 0 V reference. Power Supply: This is the power supply voltage for normal, idle, and power-down operation. Port 0: Port 0 is an open-drain, bidirectional I/O port. Port 0 pins that have 1s written to them float and can be used as high-impedance inputs. Port 0 is also the multiplexed low-order address and data bus during accesses to external program and data memory. In this application, it uses strong internal pull-ups when emitting 1s. Port 0 also outputs the code bytes during program verification and received code bytes during EPROM programming. External pull-ups are required during program verification. Port 1: Port 1 is an 8-bit bidirectional I/O port with internal pull-ups. Port 1 pins that have 1s written to them are pulled high by the internal pull-ups and can be used as inputs. As inputs, port 1 pins that are externally pulled low will source current because of the internal pull-ups. (See DC Electrical Characteristics: IIL). Port 1 also receives the low-order address byte during program memory verification. Alternate functions for Port 1 include: T2 (P1.0): Timer/Counter 2 external count input/clockout (see Programmable Clock-Out) T2EX (P1.1): Timer/Counter 2 Reload/Capture/Direction control Port 2: Port 2 is an 8-bit bidirectional I/O port with internal pull-ups. Port 2 pins that have 1s written to them are pulled high by the internal pull-ups and can be used as inputs. As inputs, port 2 pins that are externally being pulled low will source current because of the internal pull-ups. (See DC Electrical Characteristics: IIL). Port 2 emits the high-order address byte during fetches from external program memory and during accesses to external data memory that use 16-bit addresses (MOVX @DPTR). In this application, it uses strong internal pull-ups when emitting 1s. During accesses to external data memory that use 8-bit addresses (MOV @Ri), port 2 emits the contents of the P2 special function register. Some Port 2 pins receive the high order address bits during EPROM programming and verification. Port 3: Port 3 is an 8-bit bidirectional I/O port with internal pull-ups. Port 3 pins that have 1s written to them are pulled high by the internal pull-ups and can be used as inputs. As inputs, port 3 pins that are externally being pulled low will source current because of the pull-ups. (See DC Electrical Characteristics: IIL). Port 3 also serves the special features of the 80C51 family, as listed below: RxD (P3.0): Serial input port TxD (P3.1): Serial output port INT0 (P3.2): External interrupt INT1 (P3.3): External interrupt T0 (P3.4): Timer 0 external input T1 (P3.5): Timer 1 external input WR (P3.6): External data memory write strobe RD (P3.7): External data memory read strobe Reset: A high on this pin for two machine cycles while the oscillator is running, resets the device. An internal diffused resistor to VSS permits a power-on reset using only an external capacitor to VCC. Address Latch Enable/Program Pulse: Output pulse for latching the low byte of the address during an access to external memory. In normal operation, ALE is emitted at a constant rate of 1/6 (12X Mode) or 1/3 (6X Mode) the oscillator frequency, and can be used for external timing or clocking. Note that one ALE pulse is skipped during each access to external data memory. This pin is also the program pulse input (PROG) during EPROM programming. ALE can be disabled by setting SFR auxiliary.0. With this bit set, ALE will be active only during a MOVX instruction. Program Store Enable: The read strobe to external program memory. When the device is executing code from the external program memory, PSEN is activated twice each machine cycle, except that two PSEN activations are skipped during each access to external data memory. PSEN is not activated during fetches from internal program memory. External Access Enable/Programming Supply Voltage: EA must be externally held low to enable the device to fetch code from external program memory locations 0000H to 0FFFH/1FFFH/3FFFH/7FFFH. If EA is held high, the device executes from internal program memory unless the program counter contains an address greater than the on-chip ROM/OTP. This pin also receives the 12.75 V programming supply voltage (VPP) during EPROM programming. If security bit 1 is programmed, EA will be internally latched on Reset. Crystal 1: Input to the inverting oscillator amplifier and input to the internal clock generator circuits. Crystal 2: Output from the inverting oscillator amplifier.
P1.0-P1.7
1-8
2-9
40-44, 1-3
I/O
P2.0-P2.7
1 2 21-28
2 3 24-31
40 41 18-25
I/O I I/O
P3.0-P3.7
10-17
11, 13-19
5, 7-13
I/O
RST
10 11 12 13 14 15 16 17 9
11 13 14 15 16 17 18 19 10
5 7 8 9 10 11 12 13 4
I O I I I I O O I
ALE/PROG
30
33
27
O
PSEN
29
32
26
O
EA/VPP
31
35
29
I
XTAL1
19
21
15
I
XTAL2 18 20 14 O NOTE: To avoid "latch-up" effect at power-on, the voltage on any pin at any time must not be higher than VCC + 0.5 V or VSS - 0.5 V, respectively.
2001 Sep 24
9
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
Table 1.
SYMBOL ACC* AUXR# AUXR1# B* CKCON DPTR: DPH DPL IE* IP* IPH# P0* P1* P2* P3* PCON#1 PSW* RACAP2H# RACAP2L# SADDR# SADEN# SBUF SCON* SP TCON*
Special Function Registers
DESCRIPTION Accumulator Auxiliary Auxiliary 1 B register Clock Control Register Data Pointer (2 bytes) Data Pointer High Data Pointer Low Interrupt Enable Interrupt Priority Interrupt Priority High Port 0 Port 1 Port 2 Port 3 Power Control Program Status Word Timer 2 Capture High Timer 2 Capture Low Slave Address Slave Address Mask Serial Data Buffer Serial Control Stack Pointer Timer Control DIRECT ADDRESS E0H 8EH A2H F0H 8FH 83H 82H
AF AE AD AC AB AA A9 A8
MSB
E7
BIT ADDRESS, SYMBOL, OR ALTERNATIVE PORT FUNCTION LSB
E6 E5 E4 E3 E2 E1 E0
RESET VALUE 00H xxxxxxx0B xxx000x0B 00H xxx00000B 00H 00H
- -
F7
- -
F6
- -
F5
- LPEP2
F4
- WUPD
F3
- 0
F2
- -
F1
AO DPS
F0
-
-
-
-
-
-
-
X2
A8H B8H B7H 80H 90H A0H B0H 87H D0H CBH CAH A9H B9H 99H 98H 81H 88H
EA
BF
-
BE
ET2
BD
ES
BC
ET1
BB
EX1
BA
ET0
B9
EX0
B8
0x000000B xx000000B xx000000B FFH FFH FFH FFH 00xx0000B 000000x0B 00H 00H 00H 00H xxxxxxxxB 00H 07H 00H 00H xxxxxx00B 00H 00H 00H 00H 00H 00H 00H
- -
87
- -
86
PT2 PT2H
85
PS PSH
84
PT1 PT1H
83
PX1 PX1H
82
PT0 PT0H
81
PX0 PX0H
80
AD7
97
AD6
96
AD5
95
AD4
94
AD3
93
AD2
92
AD1
91
AD0
90
-
A7
-
A6
-
A5
-
A4
-
A3
-
A2
T2EX
A1
T2
A0
AD15
B7
AD14
B6
AD13
B5
AD12
B4
AD11
B3
AD10
B2
AD9
B1
AD8
B0
RD SMOD1
D7
WR SMOD0
D6
T1 -
D5
T0 POF
D4
INT1 GF1
D3
INT0 GF0
D2
TxD PD
D1
RxD IDL
D0
CY
AC
F0
RS1
RS0
OV
-
P
9F SM0/FE 8F
9E
9D
9C
9B
9A
99
98
SM1
8E
SM2
8D
REN
8C
TB8
8B
RB8
8A
TI
89
RI
88
TF1
CF
TR1
CE
TF0
CD
TR0
CC
IE1
CB
IT1
CA
IE0
C9
IT0
C8
T2CON* Timer 2 Control C8H TF2 EXF2 RCLK TCLK EXEN2 TR2 C/T2 CP/RL2 T2MOD# Timer 2 Mode Control C9H - - - - - - T2OE DCEN TH0 Timer High 0 8CH TH1 Timer High 1 8DH TH2# Timer High 2 CDH TL0 Timer Low 0 8AH TL1 Timer Low 1 8BH TL2# Timer Low 2 CCH TMOD Timer Mode 89H GATE C/T M1 M0 GATE C/T M1 M0 NOTE: Unused register bits that are not defined should not be set by the user's program. If violated, the device could function incorrectly. * SFRs are bit addressable. # SFRs are modified from or added to the 80C51 SFRs. - Reserved bits. 1. Reset value depends on reset source. 2. LPEP - Low Power EPROM operation (OTP only)
2001 Sep 24
10
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
OSCILLATOR CHARACTERISTICS
XTAL1 and XTAL2 are the input and output, respectively, of an inverting amplifier. The pins can be configured for use as an on-chip oscillator, as shown in the logic symbol. To drive the device from an external clock source, XTAL1 should be driven while XTAL2 is left unconnected. However, minimum and maximum high and low times specified in the data sheet must be observed.
on-chip RAM. An external interrupt allows both the SFRs and the on-chip RAM to retain their values. WUPD (AUXR1.3-Wakeup from Power Down) enables or disables the wakeup from power down with external interrupt. Where: WUPD = 0: Disable WUPD = 1: Enable To properly terminate Power Down, the reset or external interrupt should not be executed before VCC is restored to its normal operating level and must be held active long enough for the oscillator to restart and stabilize (normally less than 10 ms). To terminate Power Down with an external interrupt, INT0 or INT1 must be enabled and configured as level-sensitive. Holding the pin low restarts the oscillator but bringing the pin back high completes the exit. Once the interrupt is serviced, the next instruction to be executed after RETI will be the one following the instruction that put the device into Power Down.
Reset
A reset is accomplished by holding the RST pin HIGH for at least two machine cycles (24 oscillator periods in 12-clock and 12 oscillator periods in 6-clock mode), while the oscillator is running. To insure a reliable power-up reset, the RST pin must be high long enough to allow the oscillator time to start up (normally a few milliseconds) plus two machine cycles. After the reset, the part runs in 12-clock mode.
Stop Clock Mode
The static design enables the clock speed to be reduced down to 0 MHz (stopped). When the oscillator is stopped, the RAM and Special Function Registers retain their values. This mode allows step-by-step utilization and permits reduced system power consumption by lowering the clock frequency down to any value. For lowest power consumption the Power Down mode is suggested.
Low-Power EPROM operation (LPEP)
The EPROM array contains some analog circuits that are not required when VCC is less than 4 V, but are required for a VCC greater than 4 V. The LPEP bit (AUXR.4), when set, will powerdown these analog circuits resulting in a reduced supply current. This bit should be set ONLY for applications that operate at a VCC less than 4 V.
Idle Mode
In idle mode (see Table 2), the CPU puts itself to sleep while all of the on-chip peripherals stay active. The instruction to invoke the idle mode is the last instruction executed in the normal operating mode before the idle mode is activated. The CPU contents, the on-chip RAM, and all of the special function registers remain intact during this mode. The idle mode can be terminated either by any enabled interrupt (at which time the process is picked up at the interrupt service routine and continued), or by a hardware reset which starts the processor in the same manner as a power-on reset.
Design Consideration
* When the idle mode is terminated by a hardware reset, the device
normally resumes program execution from where it left off, up to two machine cycles before the internal reset algorithm takes control. On-chip hardware inhibits access to internal RAM in this event, but access to the port pins is not inhibited. To eliminate the possibility of an unexpected write when Idle is terminated by reset, the instruction following the one that invokes Idle should not be one that writes to a port pin or to external memory.
ONCETM Mode
The ONCE ("On-Circuit Emulation") Mode facilitates testing and debugging of systems without the device having to be removed from the circuit. The ONCE Mode is invoked in the following way: 1. Pull ALE low while the device is in reset and PSEN is high; 2. Hold ALE low as RST is deactivated. While the device is in ONCE Mode, the Port 0 pins go into a float state, and the other port pins and ALE and PSEN are weakly pulled high. The oscillator circuit remains active. While the device is in this mode, an emulator or test CPU can be used to drive the circuit. Normal operation is restored when a normal reset is applied.
Power-Down Mode
To save even more power, a Power Down mode (see Table 2) can be invoked by software. In this mode, the oscillator is stopped and the instruction that invoked Power Down is the last instruction executed. The on-chip RAM and Special Function Registers retain their values down to 2.0 V and care must be taken to return VCC to the minimum specified operating voltages before the Power Down Mode is terminated. Either a hardware reset or external interrupt can be used to exit from Power Down. Reset redefines all the SFRs but does not change the
Table 2. External Pin Status During Idle and Power-Down Modes
MODE Idle Idle Power-down Power-down PROGRAM MEMORY Internal External Internal External ALE 1 1 0 0 PSEN 1 1 0 0 PORT 0 Data Float Data Float PORT 1 Data Data Data Data PORT 2 Data Address Data Data PORT 3 Data Data Data Data
2001 Sep 24
11
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
Clock Control Register (CKCON)
This device provides control of the 6-clock/12-clock mode by an SFR bit (bit X2 in register CKCON). When this bit is set to 0, 12-clock mode is activated. By setting this bit to 1, the system is switching to 6-clock mode. Having this option implemented as SFR bit, it can be accessed anytime and changed to either value. An important thing to have in mind is that changing X2 from 0 to 1 will result in executing user code at twice the speed, since all system time intervals will be divided by 2. Changing from 6-clock to 12-clock mode will slow down running code by a factor of 2.
Mode 0 Putting either Timer into Mode 0 makes it look like an 8048 Timer, which is an 8-bit Counter with a divide-by-32 prescaler. Figure 2 shows the Mode 0 operation. In this mode, the Timer register is configured as a 13-bit register. As the count rolls over from all 1s to all 0s, it sets the Timer interrupt flag TFn. The counted input is enabled to the Timer when TRn = 1 and either GATE = 0 or INTn = 1. (Setting GATE = 1 allows the Timer to be controlled by external input INTn, to facilitate pulse width measurements). TRn is a control bit in the Special Function Register TCON (Figure 3). The 13-bit register consists of all 8 bits of THn and the lower 5 bits of TLn. The upper 3 bits of TLn are indeterminate and should be ignored. Setting the run flag (TRn) does not clear the registers. Mode 0 operation is the same for Timer 0 as for Timer 1. There are two different GATE bits, one for Timer 1 (TMOD.7) and one for Timer 0 (TMOD.3). Mode 1 Mode 1 is the same as Mode 0, except that the Timer register is being run with all 16 bits. Mode 2 Mode 2 configures the Timer register as an 8-bit Counter (TLn) with automatic reload, as shown in Figure 4. Overflow from TLn not only sets TFn, but also reloads TLn with the contents of THn, which is preset by software. The reload leaves THn unchanged. Mode 2 operation is the same for Timer 0 as for Timer 1. Mode 3 Timer 1 in Mode 3 simply holds its count. The effect is the same as setting TR1 = 0. Timer 0 in Mode 3 establishes TL0 and TH0 as two separate counters. The logic for Mode 3 on Timer 0 is shown in Figure 5. TL0 uses the Timer 0 control bits: C/T, GATE, TR0, and TF0 as well as pin INT0. TH0 is locked into a timer function (counting machine cycles) and takes over the use of TR1 and TF1 from Timer 1. Thus, TH0 now controls the "Timer 1" interrupt. Mode 3 is provided for applications requiring an extra 8-bit timer on the counter. With Timer 0 in Mode 3, an 80C51 can look like it has three Timer/Counters. When Timer 0 is in Mode 3, Timer 1 can be turned on and off by switching it out of and into its own Mode 3, or can still be used by the serial port as a baud rate generator, or in fact, in any application not requiring an interrupt.
Programmable Clock-Out
A 50% duty cycle clock can be programmed to be output on P1.0. This pin, besides being a regular I/O pin, has two alternate functions. It can be programmed: 1. to input the external clock for Timer/Counter 2, or 2. to output a 50% duty cycle clock ranging from 61 Hz to 4 MHz at a 16 MHz operating frequency. To configure the Timer/Counter 2 as a clock generator, bit C/T2 (in T2CON) must be cleared and bit T20E in T2MOD must be set. Bit TR2 (T2CON.2) also must be set to start the timer. The Clock-Out frequency depends on the oscillator frequency and the reload value of Timer 2 capture registers (RCAP2H, RCAP2L) as shown in this equation: 4 Where: (RCAP2H,RCAP2L) = the content of RCAP2H and RCAP2L taken as a 16-bit unsigned integer. In the Clock-Out mode Timer 2 roll-overs will not generate an interrupt. This is similar to when it is used as a baud-rate generator. It is possible to use Timer 2 as a baud-rate generator and a clock generator simultaneously. Note, however, that the baud-rate and the Clock-Out frequency will be the same. Oscillator Frequency (65536 * RCAP2H, RCAP2L)
TIMER 0 AND TIMER 1 OPERATION Timer 0 and Timer 1
The "Timer" or "Counter" function is selected by control bits C/T in the Special Function Register TMOD. These two Timer/Counters have four operating modes, which are selected by bit-pairs (M1, M0) in TMOD. Modes 0, 1, and 2 are the same for both Timers/Counters. Mode 3 is different. The four operating modes are described in the following text.
2001 Sep 24
12
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
TMOD
Address = 89H Not Bit Addressable 7 GATE 6 C/T 5 M1 4 M0 3 GATE 2 C/T 1 M1 0
Reset Value = 00H
M0
TIMER 1 BIT TMOD.3/ TMOD.7 TMOD.2/ TMOD.6 SYMBOL GATE C/T M1 0 0 1 1 1 M0 0 1 0 1 1
TIMER 0
FUNCTION Gating control when set. Timer/Counter "n" is enabled only while "INTn" pin is high and "TRn" control pin is set. when cleared Timer "n" is enabled whenever "TRn" control bit is set. Timer or Counter Selector cleared for Timer operation (input from internal system clock.) Set for Counter operation (input from "Tn" input pin). OPERATING 8048 Timer: "TLn" serves as 5-bit prescaler. 16-bit Timer/Counter: "THn" and "TLn" are cascaded; there is no prescaler. 8-bit auto-reload Timer/Counter: "THn" holds a value which is to be reloaded into "TLn" each time it overflows. (Timer 0) TL0 is an 8-bit Timer/Counter controlled by the standard Timer 0 control bits. TH0 is an 8-bit timer only controlled by Timer 1 control bits. (Timer 1) Timer/Counter 1 stopped.
SU01580
Figure 1. Timer/Counter 0/1 Mode Control (TMOD) Register
OSC
/ 12 X2 = 0
X2 = 1 /6
C/T = 0 C/T = 1
TLn (5 Bits)
THn (8 Bits)
TFn
Interrupt
Tn Pin TRn Timer n Gate bit INTn Pin
Control
SU01581
Figure 2. Timer/Counter 0/1 Mode 0: 13-Bit Timer/Counter
2001 Sep 24
13
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
TCON
Address = 88H Bit Addressable
Reset Value = 00H
7 TF1 BIT TCON.7 TCON.6 TCON.5 TCON.4 TCON.3 TCON.2 TCON.1 TCON.0 SYMBOL TF1 TR1 TF0 TR0 IE1 IT1 IE0 IT0
6 TR1
5 TF0
4 TR0
3 IE1
2 IT1
1 IE0
0 IT0
FUNCTION Timer 1 overflow flag. Set by hardware on Timer/Counter overflow. Cleared by hardware when processor vectors to interrupt routine, or clearing the bit in software. Timer 1 Run control bit. Set/cleared by software to turn Timer/Counter on/off. Timer 0 overflow flag. Set by hardware on Timer/Counter overflow. Cleared by hardware when processor vectors to interrupt routine, or by clearing the bit in software. Timer 0 Run control bit. Set/cleared by software to turn Timer/Counter on/off. Interrupt 1 Edge flag. Set by hardware when external interrupt edge detected. Cleared when interrupt processed. Interrupt 1 type control bit. Set/cleared by software to specify falling edge/low level triggered external interrupts. Interrupt 0 Edge flag. Set by hardware when external interrupt edge detected. Cleared when interrupt processed. Interrupt 0 Type control bit. Set/cleared by software to specify falling edge/low level triggered external interrupts.
SU01516
Figure 3. Timer/Counter 0/1 Control (TCON) Register
OSC
/ 12 X2 = 0 C/T = 0 TLn (8 Bits) C/T = 1 Tn Pin Control TFn Interrupt
X2 = 1 /6
TRn Timer n Gate bit THn (8 Bits) INTn Pin
Reload
SU01582
Figure 4. Timer/Counter 0/1 Mode 2: 8-Bit Auto-Reload
2001 Sep 24
14
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
OSC
/ 12 X2 = 0
X2 = 1 /6
C/T = 0 TL0 (8 Bits) C/T = 1 TF0 Interrupt
T0 Pin
Control
TR0 Timer 0 Gate bit INT0 Pin
OSC
/ 12 X2 = 0
X2 = 1 /6 Control TR1
TH0 (8 Bits)
TF1
Interrupt
SU01525
Figure 5. Timer/Counter 0 Mode 3: Two 8-Bit Counters
TIMER 2 OPERATION Timer 2
Timer 2 is a 16-bit Timer/Counter which can operate as either an event timer or an event counter, as selected by C/T2 in the special function register T2CON (see Figure 6). Timer 2 has three operating modes: Capture, Auto-reload (up or down counting), and Baud Rate Generator, which are selected by bits in the T2CON as shown in Table 3.
Auto-Reload Mode (Up or Down Counter)
In the 16-bit auto-reload mode, Timer 2 can be configured as either a timer or counter (C/T2 in T2CON), then programmed to count up or down. The counting direction is determined by bit DCEN (Down Counter Enable) which is located in the T2MOD register (see Figure 8). After reset, DCEN=0 which means Timer 2 will default to counting up. If DCEN is set, Timer 2 can count up or down depending on the value of the T2EX pin. Figure 9 shows Timer 2 which will count up automatically since DCEN=0. In this mode there are two options selected by bit EXEN2 in T2CON register. If EXEN2=0, then Timer 2 counts up to 0FFFFH and sets the TF2 (Overflow Flag) bit upon overflow. This causes the Timer 2 registers to be reloaded with the 16-bit value in RCAP2L and RCAP2H. The values in RCAP2L and RCAP2H are preset by software. If EXEN2=1, then a 16-bit reload can be triggered either by an overflow or by a 1-to-0 transition at input T2EX. This transition also sets the EXF2 bit. The Timer 2 interrupt, if enabled, can be generated when either TF2 or EXF2 are 1. In Figure 10 DCEN=1 which enables Timer 2 to count up or down. This mode allows pin T2EX to control the direction of count. When a logic 1 is applied at pin T2EX, Timer 2 will count up. Timer 2 will overflow at 0FFFFH and set the TF2 flag, which can then generate an interrupt, if the interrupt is enabled. This timer overflow also causes the 16-bit value in RCAP2L and RCAP2H to be reloaded into the timer registers TL2 and TH2.
Capture Mode
In the capture mode there are two options which are selected by bit EXEN2 in T2CON. If EXEN2=0, then timer 2 is a 16-bit timer or counter (as selected by C/T2 in T2CON) which, upon overflowing, sets bit TF2, the timer 2 overflow bit. This bit can be used to generate an interrupt (by enabling the Timer 2 interrupt bit in the IE register). If EXEN2=1, Timer 2 operates as described above, but with the added feature that a 1-to-0 transition at external input T2EX causes the current value in the Timer 2 registers, TL2 and TH2, to be captured into registers RCAP2L and RCAP2H, respectively. In addition, the transition at T2EX causes bit EXF2 in T2CON to be set, and EXF2 (like TF2) can generate an interrupt (which vectors to the same location as Timer 2 overflow interrupt. The Timer 2 interrupt service routine can interrogate TF2 and EXF2 to determine which event caused the interrupt). The capture mode is illustrated in Figure 7 (There is no reload value for TL2 and TH2 in this mode. Even when a capture event occurs from T2EX, the counter keeps on counting T2EX pin transitions or osc/12 (12-clock Mode) or osc/6 (6-clock Mode) pulses).
2001 Sep 24
15
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
A logic 0 applied to pin T2EX causes Timer 2 to count down. The timer will underflow when TL2 and TH2 become equal to the value stored in RCAP2L and RCAP2H. A Timer 2 underflow sets the TF2 flag and causes 0FFFFH to be reloaded into the timer registers TL2 and TH2.
The external flag EXF2 toggles when Timer 2 underflows or overflows. This EXF2 bit can be used as a 17th bit of resolution if needed. The EXF2 flag does not generate an interrupt in this mode of operation.
Table 3. Timer 2 Operating Modes
RCLK + TCLK 0 0 1 X CP/RL2 0 1 X X TR2 1 1 1 0 16-bit Auto-reload 16-bit Capture Baud rate generator (off) MODE
T2CON
Address = C8H Bit Addressable 7 TF2 6 EXF2 5 RCLK 4 TCLK 3 EXEN2 2 TR2 1 C/T2
Reset Value = 00H
0 CP/RL2
Symbol TF2 EXF2
Position T2CON.7 T2CON.6
Name and Significance Timer 2 overflow flag set by a Timer 2 overflow and must be cleared by software. TF2 will not be set when either RCLK or TCLK = 1. Timer 2 external flag set when either a capture or reload is caused by a negative transition on T2EX and EXEN2 = 1. When Timer 2 interrupt is enabled, EXF2 = 1 will cause the CPU to vector to the Timer 2 interrupt routine. EXF2 must be cleared by software. EXF2 does not cause an interrupt in up/down counter mode (DCEN = 1). Receive clock flag. When set, causes the serial port to use Timer 2 overflow pulses for its receive clock in modes 1 and 3. RCLK = 0 causes Timer 1 overflow to be used for the receive clock. Transmit clock flag. When set, causes the serial port to use Timer 2 overflow pulses for its transmit clock in modes 1 and 3. TCLK = 0 causes Timer 1 overflows to be used for the transmit clock. Timer 2 external enable flag. When set, allows a capture or reload to occur as a result of a negative transition on T2EX if Timer 2 is not being used to clock the serial port. EXEN2 = 0 causes Timer 2 to ignore events at T2EX. Start/stop control for Timer 2. A logic 1 starts the timer. Timer or counter select. (Timer 2) 0 = Internal timer (OSC/12 or OSC/6, depending on mode) 1 = External event counter (falling edge triggered). Capture/Reload flag. When set, captures will occur on negative transitions at T2EX if EXEN2 = 1. When cleared, auto-reloads will occur either with Timer 2 overflows or negative transitions at T2EX when EXEN2 = 1. When either RCLK = 1 or TCLK = 1, this bit is ignored and the timer is forced to auto-reload on Timer 2 overflow.
SU01518
RCLK TCLK EXEN2
T2CON.5 T2CON.4 T2CON.3
TR2 C/T2
T2CON.2 T2CON.1
CP/RL2
T2CON.0
Figure 6. Timer/Counter 2 (T2CON) Control Register
2001 Sep 24
16
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
OSC
/ 12 X2 = 0 C/T2 = 0 TL2 (8-bits) C/T2 = 1 T2 Pin Control TH2 (8-bits) TF2
X2 = 1 /6
TR2 Transition Detector
Capture Timer 2 Interrupt RCAP2L RCAP2H
T2EX Pin
EXF2
Control
EXEN2
SU01496
Figure 7. Timer 2 in Capture Mode
T2MOD
Address = 0C9H Not Bit Addressable 7 -- 6 -- 5 -- 4 -- 3 -- 2 -- 1 T2OE
Reset Value = XXXX XX00B
0 DCEN
Symbol -- T2OE DCEN *
Position
Function Not implemented, reserved for future use.*
T2MOD.1 T2MOD.0
Timer 2 Output Enable bit.
Down Count Enable bit. When set, this allows Timer 2 to be configured as an up/down counter. User software should not write 1s to reserved bits. These bits may be used in future 8051 family products to invoke new features. In that case, the reset or inactive value of the new bit will be 0, and its active value will be 1. The value read from a reserved bit is indeterminate.
SU01519
Figure 8. Timer 2 Mode (T2MOD) Control Register
2001 Sep 24
17
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
OSC
/ 12 X2 = 0 C/T2 = 0 TL2 (8-BITS) C/T2 = 1 T2 Pin CONTROL TH2 (8-BITS)
X2 = 1 /6
TR2
RELOAD
TRANSITION DETECTOR
RCAP2L
RCAP2H TF2 TIMER 2 INTERRUPT
T2EX PIN
EXF2
CONTROL
EXEN2
SU01497
Figure 9. Timer 2 in Auto-Reload Mode (DCEN = 0)
(DOWN COUNTING RELOAD VALUE) FFH FFH
TOGGLE EXF2
OSC
/ 12 X2 = 0
X2 = 1 /6
C/T2 = 0 OVERFLOW TL2 C/T2 = 1 CONTROL TR2 COUNT DIRECTION 1 = UP 0 = DOWN RCAP2L RCAP2H T2EX PIN TH2 TF2 INTERRUPT
T2 Pin
(UP COUNTING RELOAD VALUE)
SU01498
Figure 10. Timer 2 Auto Reload Mode (DCEN = 1)
2001 Sep 24
18
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
Timer 1 Overflow
NOTE: OSC. Freq. is divided by 2, not 12 or 6. /2 C/T2 = 0 TL2 (8-bits) C/T2 = 1 T2 Pin Control TH2 (8-bits) "1"
/2 "0" "1" SMOD "0" RCLK
OSC
/ 16 TR2 "1" Reload "0"
RX Clock
TCLK
Transition Detector
RCAP2L
RCAP2H
/ 16
TX Clock
T2EX Pin
EXF2
Timer 2 Interrupt
Control EXEN2 Note availability of additional external interrupt.
SU01520
Figure 11. Timer 2 in Baud Rate Generator Mode
Baud Rate Generator Mode
Bits TCLK and/or RCLK in T2CON (Table 3) allow the serial port transmit and receive baud rates to be derived from either Timer 1 or Timer 2. When TCLK= 0, Timer 1 is used as the serial port transmit baud rate generator. When TCLK= 1, Timer 2 is used as the serial port transmit baud rate generator. RCLK has the same effect for the serial port receive baud rate. With these two bits, the serial port can have different receive and transmit baud rates - one generated by Timer 1, the other by Timer 2. Figure 11 shows the Timer 2 in baud rate generation mode. The baud rate generation mode is like the auto-reload mode, in that a rollover in TH2 causes the Timer 2 registers to be reloaded with the 16-bit value in registers RCAP2H and RCAP2L, which are preset by software. The baud rates in modes 1 and 3 are determined by Timer 2's overflow rate given below: Modes 1 and 3 Baud Rates + Timer 2 Overflow Rate 16 The timer can be configured for either "timer" or "counter" operation. In many applications, it is configured for "timer" operation (C/T2=0). Timer operation is different for Timer 2 when it is being used as a baud rate generator. Usually, as a timer it would increment every machine cycle (i.e., 1/6 or 1/12 the oscillator frequency, depending on the Mode). As a baud rate generator, it increments every state time (i.e., 1/2 the oscillator frequency). Thus the baud rate formula is as follows:
Modes 1 and 3 Baud Rates = Oscillator Frequency [32 [65536 * (RCAP2H, RCAP2L)]] Where: (RCAP2H, RCAP2L)= The content of RCAP2H and RCAP2L taken as a 16-bit unsigned integer. The Timer 2 as a baud rate generator mode shown in Figure 11 is valid only if RCLK and/or TCLK = 1 in T2CON register. Note that a rollover in TH2 does not set TF2, and will not generate an interrupt. Thus, the Timer 2 interrupt does not have to be disabled when Timer 2 is in the baud rate generator mode. Also if the EXEN2 (T2 external enable flag) is set, a 1-to-0 transition in T2EX (Timer/counter 2 trigger input) will set EXF2 (T2 external flag) but will not cause a reload from (RCAP2H, RCAP2L) to (TH2,TL2). Therefore when Timer 2 is in use as a baud rate generator, T2EX can be used as an additional external interrupt, if needed. When Timer 2 is in the baud rate generator mode, one should not try to read or write TH2 and TL2. As a baud rate generator, Timer 2 is incremented every state time (osc/2) or asynchronously from pin T2; under these conditions, a read or write of TH2 or TL2 may not be accurate. The RCAP2 registers may be read, but should not be written to, because a write might overlap a reload and cause write and/or reload errors. The timer should be turned off (clear TR2) before accessing the Timer 2 or RCAP2 registers. Table 4 shows commonly used baud rates and how they can be obtained from Timer 2.
2001 Sep 24
19
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
Table 4.
Timer 2 Generated Commonly Used Baud Rates
Timer 2 Osc Freq 12 MHz 12 MHz 12 MHz 12 MHz 12 MHz 12 MHz 12 MHz 6 MHz 6 MHz RCAP2H FF FF FF FF FE FB F2 FD F9 RCAP2L FF D9 B2 64 C8 1E AF 8F 57
must be set, separately, to turn the timer on. See Table 5 for set-up of Timer 2 as a timer. Also see Table 6 for set-up of Timer 2 as a counter.
Ba d Rate Baud 375 K 9.6 K 4.8 K 2.4 K 1.2 K 300 110 300 110
Table 5. Timer 2 as a Timer
T2CON MODE INTERNAL CONTROL (Note 1) 00H 01H 34H 24H 14H EXTERNAL CONTROL (Note 2) 08H 09H 36H 26H 16H
16-bit Auto-Reload 16-bit Capture Baud rate generator receive and transmit same baud rate Receive only Transmit only
Summary Of Baud Rate Equations
Timer 2 is in baud rate generating mode. If Timer 2 is being clocked through pin T2(P1.0) the baud rate is: Baud Rate + Timer 2 Overflow Rate 16 If Timer 2 is being clocked internally, the baud rate is: Baud Rate + f OSC [65536 * (RCAP2H, RCAP2L)]]
Table 6. Timer 2 as a Counter
TMOD MODE INTERNAL CONTROL (Note 1) 02H 03H EXTERNAL CONTROL (Note 2) 0AH 0BH
[32
16-bit Auto-Reload
Where fOSC= Oscillator Frequency To obtain the reload value for RCAP2H and RCAP2L, the above equation can be rewritten as: RCAP2H, RCAP2L + 65536 * f OSC Baud Rate
32
NOTES: 1. Capture/reload occurs only on timer/counter overflow. 2. Capture/reload occurs on timer/counter overflow and a 1-to-0 transition on T2EX (P1.1) pin except when Timer 2 is used in the baud rate generator mode.
Timer/Counter 2 Set-up
Except for the baud rate generator mode, the values given for T2CON do not include the setting of the TR2 bit. Therefore, bit TR2
2001 Sep 24
20
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
FULL-DUPLEX ENHANCED UART Standard UART operation
The serial port is full duplex, meaning it can transmit and receive simultaneously. It is also receive-buffered, meaning it can commence reception of a second byte before a previously received byte has been read from the register. (However, if the first byte still hasn't been read by the time reception of the second byte is complete, one of the bytes will be lost.) The serial port receive and transmit registers are both accessed at Special Function Register SBUF. Writing to SBUF loads the transmit register, and reading SBUF accesses a physically separate receive register. The serial port can operate in 4 modes: Mode 0: Serial data enters and exits through RxD. TxD outputs the shift clock. 8 bits are transmitted/received (LSB first). The baud rate is fixed at 1/12 the oscillator frequency. 10 bits are transmitted (through TxD) or received (through RxD): a start bit (0), 8 data bits (LSB first), and a stop bit (1). On receive, the stop bit goes into RB8 in Special Function Register SCON. The baud rate is variable. 11 bits are transmitted (through TxD) or received (through RxD): start bit (0), 8 data bits (LSB first), a programmable 9th data bit, and a stop bit (1). On Transmit, the 9th data bit (TB8 in SCON) can be assigned the value of 0 or 1. Or, for example, the parity bit (P, in the PSW) could be moved into TB8. On receive, the 9th data bit goes into RB8 in Special Function Register SCON, while the stop bit is ignored. The baud rate is programmable to either 1/32 or 1/64 the oscillator frequency. 11 bits are transmitted (through TxD) or received (through RxD): a start bit (0), 8 data bits (LSB first), a programmable 9th data bit, and a stop bit (1). In fact, Mode 3 is the same as Mode 2 in all respects except baud rate. The baud rate in Mode 3 is variable.
9th bit is 1 in an address byte and 0 in a data byte. With SM2 = 1, no slave will be interrupted by a data byte. An address byte, however, will interrupt all slaves, so that each slave can examine the received byte and see if it is being addressed. The addressed slave will clear its SM2 bit and prepare to receive the data bytes that will be coming. The slaves that weren't being addressed leave their SM2s set and go on about their business, ignoring the coming data bytes. SM2 has no effect in Mode 0, and in Mode 1 can be used to check the validity of the stop bit. In a Mode 1 reception, if SM2 = 1, the receive interrupt will not be activated unless a valid stop bit is received. Serial Port Control Register The serial port control and status register is the Special Function Register SCON, shown in Figure 12. This register contains not only the mode selection bits, but also the 9th data bit for transmit and receive (TB8 and RB8), and the serial port interrupt bits (TI and RI). Baud Rates The baud rate in Mode 0 is fixed: Mode 0 Baud Rate = Oscillator Frequency / 12. The baud rate in Mode 2 depends on the value of bit SMOD in Special Function Register PCON. If SMOD = 0 (which is the value on reset), the baud rate is 1/64 the oscillator frequency. If SMOD = 1, the baud rate is 1/32 the oscillator frequency. Mode 2 Baud Rate = 2 SMOD 64 (Oscillator Frequency)
Mode 1:
Mode 2:
In the 80C51, the baud rates in Modes 1 and 3 are determined by the Timer 1 overflow rate. Using Timer 1 to Generate Baud Rates When Timer 1 is used as the baud rate generator, the baud rates in Modes 1 and 3 are determined by the Timer 1 overflow rate and the value of SMOD as follows: Mode 1, 3 Baud Rate = 2 SMOD 32 (Timer 1 Overflow Rate)
Mode 3:
In all four modes, transmission is initiated by any instruction that uses SBUF as a destination register. Reception is initiated in Mode 0 by the condition RI = 0 and REN = 1. Reception is initiated in the other modes by the incoming start bit if REN = 1. Multiprocessor Communications Modes 2 and 3 have a special provision for multiprocessor communications. In these modes, 9 data bits are received. The 9th one goes into RB8. Then comes a stop bit. The port can be programmed such that when the stop bit is received, the serial port interrupt will be activated only if RB8 = 1. This feature is enabled by setting bit SM2 in SCON. A way to use this feature in multiprocessor systems is as follows: When the master processor wants to transmit a block of data to one of several slaves, it first sends out an address byte which identifies the target slave. An address byte differs from a data byte in that the
The Timer 1 interrupt should be disabled in this application. The Timer itself can be configured for either "timer" or "counter" operation, and in any of its 3 running modes. In the most typical applications, it is configured for "timer" operation, in the auto-reload mode (high nibble of TMOD = 0010B). In that case the baud rate is given by the formula: Mode 1, 3 Baud Rate = 2 SMOD 32 Oscillator Frequency 12 [256 * (TH1)]
One can achieve very low baud rates with Timer 1 by leaving the Timer 1 interrupt enabled, and configuring the Timer to run as a 16-bit timer (high nibble of TMOD = 0001B), and using the Timer 1 interrupt to do a 16-bit software reload. Figure 13 lists various commonly used baud rates and how they can be obtained from Timer 1.
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Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
SCON
Address = 98H Bit Addressable
Reset Value = 00H 7 SM0 6 SM1 5 SM2 4 REN 3 TB8 2 RB8 1 TI 0 RI
Where SM0, SM1 specify the serial port mode, as follows: SM0 0 0 1 1 SM2 SM1 0 1 0 1 Mode 0 1 2 3 Description shift register 8-bit UART 9-bit UART 9-bit UART Baud Rate fOSC/ 12 variable fOSC/64 or fOSC/32 variable
Enables the multiprocessor communication feature in Modes 2 and 3. In Mode 2 or 3, if SM2 is set to 1, then Rl will not be activated if the received 9th data bit (RB8) is 0. In Mode 1, if SM2=1 then RI will not be activated if a valid stop bit was not received. In Mode 0, SM2 should be 0. Enables serial reception. Set by software to enable reception. Clear by software to disable reception. The 9th data bit that will be transmitted in Modes 2 and 3. Set or clear by software as desired. In Modes 2 and 3, is the 9th data bit that was received. In Mode 1, it SM2=0, RB8 is the stop bit that was received. In Mode 0, RB8 is not used. Transmit interrupt flag. Set by hardware at the end of the 8th bit time in Mode 0, or at the beginning of the stop bit in the other modes, in any serial transmission. Must be cleared by software. Receive interrupt flag. Set by hardware at the end of the 8th bit time in Mode 0, or halfway through the stop bit time in the other modes, in any serial reception (except see SM2). Must be cleared by software.
SU01526
REN TB8 RB8 TI RI
Figure 12. Serial Port Control (SCON) Register Timer 1 Baud Ba d Rate Mode 0 Max: 1.67MHz Mode 2 Max: 625k Mode 1, 3 Max: 104.2k 19.2k 9.6k 4.8k 2.4k 1.2k 137.5 110 110 fOSC 20MHz 20MHz 20MHz 11.059MHz 11.059MHz 11.059MHz 11.059MHz 11.059MHz 11.986MHz 6MHz 12MHz SMOD C/T X 1 1 1 0 0 0 0 0 0 0 X X 0 0 0 0 0 0 0 0 0 Mode X X 2 2 2 2 2 2 2 2 1 Reload Value X X FFH FDH FDH FAH F4H E8H 1DH 72H FEEBH
Figure 13. Timer 1 Generated Commonly Used Baud Rates More About Mode 0 Serial data enters and exits through RxD. TxD outputs the shift clock. 8 bits are transmitted/received: 8 data bits (LSB first). The baud rate is fixed a 1/12 the oscillator frequency. Figure 14 shows a simplified functional diagram of the serial port in Mode 0, and associated timing. Transmission is initiated by any instruction that uses SBUF as a destination register. The "write to SBUF" signal at S6P2 also loads a 1 into the 9th position of the transmit shift register and tells the TX Control block to commence a transmission. The internal timing is such that one full machine cycle will elapse between "write to SBUF" and activation of SEND. SEND enables the output of the shift register to the alternate output function line of P3.0 and also enable SHIFT CLOCK to the alternate output function line of P3.1. SHIFT CLOCK is low during S3, S4, and S5 of every machine cycle, and high during S6, S1, and S2. At S6P2 of every machine cycle in which SEND is active, the contents of the transmit shift are shifted to the right one position. As data bits shift out to the right, zeros come in from the left. When the MSB of the data byte is at the output position of the shift register, then the 1 that was initially loaded into the 9th position, is just to the left of the MSB, and all positions to the left of that contain zeros. This condition flags the TX Control block to do one last shift and then deactivate SEND and set T1. Both of these actions occur at S1P1 of the 10th machine cycle after "write to SBUF." Reception is initiated by the condition REN = 1 and R1 = 0. At S6P2 of the next machine cycle, the RX Control unit writes the bits 11111110 to the receive shift register, and in the next clock phase activates RECEIVE. RECEIVE enable SHIFT CLOCK to the alternate output function line of P3.1. SHIFT CLOCK makes transitions at S3P1 and S6P1 of every machine cycle. At S6P2 of every machine cycle in which
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Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
RECEIVE is active, the contents of the receive shift register are shifted to the left one position. The value that comes in from the right is the value that was sampled at the P3.0 pin at S5P2 of the same machine cycle. As data bits come in from the right, 1s shift out to the left. When the 0 that was initially loaded into the rightmost position arrives at the leftmost position in the shift register, it flags the RX Control block to do one last shift and load SBUF. At S1P1 of the 10th machine cycle after the write to SCON that cleared RI, RECEIVE is cleared as RI is set. More About Mode 1 Ten bits are transmitted (through TxD), or received (through RxD): a start bit (0), 8 data bits (LSB first), and a stop bit (1). On receive, the stop bit goes into RB8 in SCON. In the 80C51 the baud rate is determined by the Timer 1 overflow rate. Figure 15 shows a simplified functional diagram of the serial port in Mode 1, and associated timings for transmit receive. Transmission is initiated by any instruction that uses SBUF as a destination register. The "write to SBUF" signal also loads a 1 into the 9th bit position of the transmit shift register and flags the TX Control unit that a transmission is requested. Transmission actually commences at S1P1 of the machine cycle following the next rollover in the divide-by-16 counter. (Thus, the bit times are synchronized to the divide-by-16 counter, not to the "write to SBUF" signal.) The transmission begins with activation of SEND which puts the start bit at TxD. One bit time later, DATA is activated, which enables the output bit of the transmit shift register to TxD. The first shift pulse occurs one bit time after that. As data bits shift out to the right, zeros are clocked in from the left. When the MSB of the data byte is at the output position of the shift register, then the 1 that was initially loaded into the 9th position is just to the left of the MSB, and all positions to the left of that contain zeros. This condition flags the TX Control unit to do one last shift and then deactivate SEND and set TI. This occurs at the 10th divide-by-16 rollover after "write to SBUF." Reception is initiated by a detected 1-to-0 transition at RxD. For this purpose RxD is sampled at a rate of 16 times whatever baud rate has been established. When a transition is detected, the divide-by-16 counter is immediately reset, and 1FFH is written into the input shift register. Resetting the divide-by-16 counter aligns its rollovers with the boundaries of the incoming bit times. The 16 states of the counter divide each bit time into 16ths. At the 7th, 8th, and 9th counter states of each bit time, the bit detector samples the value of RxD. The value accepted is the value that was seen in at least 2 of the 3 samples. This is done for noise rejection. If the value accepted during the first bit time is not 0, the receive circuits are reset and the unit goes back to looking for another 1-to-0 transition. This is to provide rejection of false start bits. If the start bit proves valid, it is shifted into the input shift register, and reception of the rest of the frame will proceed. As data bits come in from the right, 1s shift out to the left. When the start bit arrives at the leftmost position in the shift register (which in mode 1 is a 9-bit register), it flags the RX Control block to do one last shift, load SBUF and RB8, and set RI. The signal to load SBUF and RB8, and to set RI, will be generated if, and only if, the following conditions are met at the time the final shift pulse is generated.: 1. R1 = 0, and 2. Either SM2 = 0, or the received stop bit = 1. If either of these two conditions is not met, the received frame is irretrievably lost. If both conditions are met, the stop bit goes into
RB8, the 8 data bits go into SBUF, and RI is activated. At this time, whether the above conditions are met or not, the unit goes back to looking for a 1-to-0 transition in RxD. More About Modes 2 and 3 Eleven bits are transmitted (through TxD), or received (through RxD): a start bit (0), 8 data bits (LSB first), a programmable 9th data bit, and a stop bit (1). On transmit, the 9th data bit (TB8) can be assigned the value of 0 or 1. On receive, the 9the data bit goes into RB8 in SCON. The baud rate is programmable to either 1/32 or 1/64 the oscillator frequency in Mode 2. Mode 3 may have a variable baud rate generated from Timer 1. Figures 16 and 17 show a functional diagram of the serial port in Modes 2 and 3. The receive portion is exactly the same as in Mode 1. The transmit portion differs from Mode 1 only in the 9th bit of the transmit shift register. Transmission is initiated by any instruction that uses SBUF as a destination register. The "write to SBUF" signal also loads TB8 into the 9th bit position of the transmit shift register and flags the TX Control unit that a transmission is requested. Transmission commences at S1P1 of the machine cycle following the next rollover in the divide-by-16 counter. (Thus, the bit times are synchronized to the divide-by-16 counter, not to the "write to SBUF" signal.) The transmission begins with activation of SEND, which puts the start bit at TxD. One bit time later, DATA is activated, which enables the output bit of the transmit shift register to TxD. The first shift pulse occurs one bit time after that. The first shift clocks a 1 (the stop bit) into the 9th bit position of the shift register. Thereafter, only zeros are clocked in. Thus, as data bits shift out to the right, zeros are clocked in from the left. When TB8 is at the output position of the shift register, then the stop bit is just to the left of TB8, and all positions to the left of that contain zeros. This condition flags the TX Control unit to do one last shift and then deactivate SEND and set TI. This occurs at the 11th divide-by-16 rollover after "write to SUBF." Reception is initiated by a detected 1-to-0 transition at RxD. For this purpose RxD is sampled at a rate of 16 times whatever baud rate has been established. When a transition is detected, the divide-by-16 counter is immediately reset, and 1FFH is written to the input shift register. At the 7th, 8th, and 9th counter states of each bit time, the bit detector samples the value of R-D. The value accepted is the value that was seen in at least 2 of the 3 samples. If the value accepted during the first bit time is not 0, the receive circuits are reset and the unit goes back to looking for another 1-to-0 transition. If the start bit proves valid, it is shifted into the input shift register, and reception of the rest of the frame will proceed. As data bits come in from the right, 1s shift out to the left. When the start bit arrives at the leftmost position in the shift register (which in Modes 2 and 3 is a 9-bit register), it flags the RX Control block to do one last shift, load SBUF and RB8, and set RI. The signal to load SBUF and RB8, and to set RI, will be generated if, and only if, the following conditions are met at the time the final shift pulse is generated. 1. RI = 0, and 2. Either SM2 = 0, or the received 9th data bit = 1. If either of these conditions is not met, the received frame is irretrievably lost, and RI is not set. If both conditions are met, the received 9th data bit goes into RB8, and the first 8 data bits go into SBUF. One bit time later, whether the above conditions were met or not, the unit goes back to looking for a 1-to-0 transition at the RxD input.
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Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
80C51 Internal Bus
Write to SBUF D
S CL
Q
SBUF
RxD P3.0 Alt Output Function
Zero Detector
Start TX Control S6 Serial Port Interrupt RX Clock R1 RX Control REN RI Start LSB Input Shift Register 1 1 1 1 1 1 1 TX Clock T1
Shift
Send
Receive Shift 0 MSB
Shift Clock
TxD P3.1 Alt Output Function
Shift Load SBUF
RxD P3.0 Alt Input Function
LSB
SBUF
MSB
Read SBUF
80C51 Internal Bus
S4 . . ALE
S1 . . . . S6 S1 . . . . S6 S1 . . . . S6 S1 . . . . S6 S1 . . . . S6 S1 . . . . S6 S1 . . . . S6 S1 . . . . S6 S1 . . . . S6 S1 . . . . S6 S1
Write to SBUF Send Shift S6P2 Transmit D0 D1 D2 D3 D4 D5 D6 D7
RxD (Data Out) TxD (Shift Clock) TI
S3P1
S6P1
Write to SCON (Clear RI) RI Receive Shift RxD (Data In) D0 S5P2 TxD (Shift Clock) D1 D2 D3 D4 D5 D6 D7 Receive
SU00539
Figure 14. Serial Port Mode 0
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Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
Timer 1 Overflow TB8
80C51 Internal Bus
/2 SMOD = 0 SMOD = 1
Write to SBUF D CL
S
Q
SBUF TxD
Zero Detector
Start TX Control / 16 Serial Port Interrupt / 16 TX Clock T1
Shift
Data
Send
Sample 1-to-0 Transition Detector Start
RX Clock RI RX Control
Load SBUF Shift 1FFH
Bit Detector Input Shift Register (9 Bits) Shift RxD Load SBUF
SBUF
Read SBUF
80C51 Internal Bus TX Clock Write to SBUF Send Data Shift TxD TI / 16 Reset RX Clock RxD Bit Detector Sample Times Shift RI Start Bit D0 D1 D2 D3 D4 D5 D6 D7 Stop Bit Receive Start Bit D0 D1 D2 D3 D4 D5 D6 D7 Stop Bit S1P1 Transmit
SU00540
Figure 15. Serial Port Mode 1
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Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
80C51 Internal Bus TB8
Write to SBUF D CL Phase 2 Clock (1/2 fOSC)
S
Q
SBUF
TxD
Zero Detector
Mode 2 Start / 16 Serial Port Interrupt SMOD = 0 (SMOD is PCON.7) Sample 1-to-0 Transition Detector Start / 16
Stop Bit Gen. TX Control T1
Shift
Data
SMOD = 1 /2
TX Clock
Send
RX Clock
R1
Load SBUF Shift 1FFH
RX Control
Bit Detector Input Shift Register (9 Bits) Shift RxD Load SBUF
SBUF
Read SBUF
80C51 Internal Bus TX Clock Write to SBUF Send Data Shift TxD TI Stop Bit Gen. / 16 Reset RX Clock RxD Bit Detector Sample Times Shift RI Start Bit D0 D1 D2 D3 D4 D5 D6 D7 RB8 Stop Bit Receive Start Bit D0 D1 D2 D3 D4 D5 D6 D7 TB8 Stop Bit S1P1 Transmit
SU00541
Figure 16. Serial Port Mode 2 2001 Sep 24 26
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
Timer 1 Overflow TB8
80C51 Internal Bus
/2
SMOD = 0 SMOD = 1
Write to SBUF D CL
S
Q
SBUF TxD
Zero Detector
Start TX Control
Shift
Data
/ 16
Serial Port Interrupt
TX Clock
T1
Send
/ 16
R1 Load SBUF Shift 1FFH
Sample 1-to-0 Transition Detector Start
RX Clock
RX Control
Bit Detector Input Shift Register (9 Bits) Shift RxD Load SBUF
SBUF
Read SBUF
80C51 Internal Bus TX Clock Write to SBUF Send Data Shift TxD TI Stop Bit Gen. RX Clock RxD Bit Detector Sample Times Shift RI / 16 Reset Start Bit D0 D1 D2 D3 D4 D5 D6 D7 TB8 Stop Bit S1P1 Transmit
Start Bit
D0
D1
D2
D3
D4
D5
D6
D7
RB8
Stop Bit Receive
SU00542
Figure 17. Serial Port Mode 3 2001 Sep 24 27
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
Enhanced UART operation
In addition to the standard operation modes, the UART can perform framing error detect by looking for missing stop bits, and automatic address recognition. The UART also fully supports multiprocessor communication. When used for framing error detect the UART looks for missing stop bits in the communication. A missing bit will set the FE bit in the SCON register. The FE bit shares the SCON.7 bit with SM0 and the function of SCON.7 is determined by PCON.6 (SMOD0) (see Figure 18). If SMOD0 is set then SCON.7 functions as FE. SCON.7 functions as SM0 when SMOD0 is cleared. When used as FE SCON.7 can only be cleared by software. Refer to Figure 19. Automatic Address Recognition Automatic Address Recognition is a feature which allows the UART to recognize certain addresses in the serial bit stream by using hardware to make the comparisons. This feature saves a great deal of software overhead by eliminating the need for the software to examine every serial address which passes by the serial port. This feature is enabled by setting the SM2 bit in SCON. In the 9 bit UART modes, mode 2 and mode 3, the Receive Interrupt flag (RI) will be automatically set when the received byte contains either the "Given" address or the "Broadcast" address. The 9 bit mode requires that the 9th information bit is a 1 to indicate that the received information is an address and not data. Automatic address recognition is shown in Figure 20. The 8 bit mode is called Mode 1. In this mode the RI flag will be set if SM2 is enabled and the information received has a valid stop bit following the 8 address bits and the information is either a Given or Broadcast address. Mode 0 is the Shift Register mode and SM2 is ignored. Using the Automatic Address Recognition feature allows a master to selectively communicate with one or more slaves by invoking the Given slave address or addresses. All of the slaves may be contacted by using the Broadcast address. Two special Function Registers are used to define the slave's address, SADDR, and the address mask, SADEN. SADEN is used to define which bits in the SADDR are to be used and which bits are "don't care". The SADEN mask can be logically ANDed with the SADDR to create the "Given" address which the master will use for addressing each of the slaves. Use of the Given address allows multiple slaves to be recognized while excluding others. The following examples will help to show the versatility of this scheme: Slave 0 SADDR = SADEN = Given = 1100 0000 1111 1101 1100 00X0
Slave 1
SADDR = SADEN = Given =
1100 0000 1111 1110 1100 000X
In the above example SADDR is the same and the SADEN data is used to differentiate between the two slaves. Slave 0 requires a 0 in bit 0 and it ignores bit 1. Slave 1 requires a 0 in bit 1 and bit 0 is ignored. A unique address for Slave 0 would be 1100 0010 since slave 1 requires a 0 in bit 1. A unique address for slave 1 would be 1100 0001 since a 1 in bit 0 will exclude slave 0. Both slaves can be selected at the same time by an address which has bit 0 = 0 (for slave 0) and bit 1 = 0 (for slave 1). Thus, both could be addressed with 1100 0000. In a more complex system the following could be used to select slaves 1 and 2 while excluding slave 0: Slave 0 SADDR = SADEN = Given = SADDR = SADEN = Given = SADDR = SADEN = Given = 1100 0000 1111 1001 1100 0XX0 1110 0000 1111 1010 1110 0X0X 1110 0000 1111 1100 1110 00XX
Slave 1
Slave 2
In the above example the differentiation among the 3 slaves is in the lower 3 address bits. Slave 0 requires that bit 0 = 0 and it can be uniquely addressed by 1110 0110. Slave 1 requires that bit 1 = 0 and it can be uniquely addressed by 1110 and 0101. Slave 2 requires that bit 2 = 0 and its unique address is 1110 0011. To select Slaves 0 and 1 and exclude Slave 2 use address 1110 0100, since it is necessary to make bit 2 = 1 to exclude slave 2. The Broadcast Address for each slave is created by taking the logical OR of SADDR and SADEN. Zeros in this result are trended as don't-cares. In most cases, interpreting the don't-cares as ones, the broadcast address will be FF hexadecimal. Upon reset SADDR (SFR address 0A9H) and SADEN (SFR address 0B9H) are leaded with 0s. This produces a given address of all "don't cares" as well as a Broadcast address of all "don't cares". This effectively disables the Automatic Addressing mode and allows the microcontroller to use standard 80C51 type UART drivers which do not make use of this feature.
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Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
SCON Address = 98H Bit Addressable 7 SM0/FE 6 SM1 5 SM2 4 REN 3 TB8 2 RB8 1 Tl 0 Rl
Reset Value = 0000 0000B
(SMOD0 = 0/1)* Symbol FE Position SCON.7 Function Framing Error bit. This bit is set by the receiver when an invalid stop bit is detected. The FE bit is not cleared by valid frames but should be cleared by software. The SMOD0 bit must be set to enable access to the FE bit.* Serial Port Mode Bit 0, (SMOD0 must = 0 to access bit SM0) Serial Port Mode Bit 1 SM0 0 0 1 1 SM2 SCON.5 SM1 0 1 0 1 Mode 0 1 2 3 Description shift register 8-bit UART 9-bit UART 9-bit UART Baud Rate** fOSC/12 or fOSC/6 depending on the mode variable fOSC/64 or fOSC/32 variable
SM0 SM1
SCON.7 SCON.6
Enables the Automatic Address Recognition feature in Modes 2 or 3. If SM2 = 1 then Rl will not be set unless the received 9th data bit (RB8) is 1, indicating an address, and the received byte is a Given or Broadcast Address. In Mode 1, if SM2 = 1 then Rl will not be activated unless a valid stop bit was received, and the received byte is a Given or Broadcast Address. In Mode 0, SM2 should be 0. Enables serial reception. Set by software to enable reception. Clear by software to disable reception. The 9th data bit that will be transmitted in Modes 2 and 3. Set or clear by software as desired. In modes 2 and 3, the 9th data bit that was received. In Mode 1, if SM2 = 0, RB8 is the stop bit that was received. In Mode 0, RB8 is not used. Transmit interrupt flag. Set by hardware at the end of the 8th bit time in Mode 0, or at the beginning of the stop bit in the other modes, in any serial transmission. Must be cleared by software. Receive interrupt flag. Set by hardware at the end of the 8th bit time in Mode 0, or halfway through the stop bit time in the other modes, in any serial reception (except see SM2). Must be cleared by software.
SU01484
REN TB8 RB8
SCON.4 SCON.3 SCON.2
Tl Rl
SCON.1 SCON.0
NOTES: *SMOD0 is located at PCON.6. **fOSC = oscillator frequency
Figure 18. SCON: Serial Port Control Register
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Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
D0
D1
D2
D3
D4
D5
D6
D7
D8
START BIT
DATA BYTE
ONLY IN MODE 2, 3
STOP BIT
SET FE BIT IF STOP BIT IS 0 (FRAMING ERROR) SM0 TO UART MODE CONTROL
SM0 / FE
SM1
SM2
REN
TB8
RB8
TI
RI
SCON (98H)
SMOD1
SMOD0
-
POF
GF1
GF0
PD
IDL
PCON (87H)
0 : SCON.7 = SM0 1 : SCON.7 = FE
SU01191
Figure 19. UART Framing Error Detection
D0
D1
D2
D3
D4
D5
D6
D7
D8
SM0 1 1
SM1 1 0
SM2 1
REN 1
TB8 X
RB8
TI
RI
SCON (98H)
RECEIVED ADDRESS D0 TO D7 PROGRAMMED ADDRESS COMPARATOR
IN UART MODE 2 OR MODE 3 AND SM2 = 1: INTERRUPT IF REN=1, RB8=1 AND "RECEIVED ADDRESS" = "PROGRAMMED ADDRESS" - WHEN OWN ADDRESS RECEIVED, CLEAR SM2 TO RECEIVE DATA BYTES - WHEN ALL DATA BYTES HAVE BEEN RECEIVED: SET SM2 TO WAIT FOR NEXT ADDRESS.
SU00045
Figure 20. UART Multiprocessor Communication, Automatic Address Recognition
2001 Sep 24
30
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
Interrupt Priority Structure
0 INT0 1 IT0 IE0
Priority Level Structure Each interrupt source can also be individually programmed to one of four priority levels by setting or clearing bits in Special Function Registers IP (Figure 23) and IPH (Figure 24). A lower-priority interrupt can itself be interrupted by a higher-priority interrupt, but not by another interrupt of the same level. A high-priority level 3 interrupt can't be interrupted by any other interrupt source. If two request of different priority levels are received simultaneously, the request of higher priority level is serviced. If requests of the same priority level are received simultaneously, an internal polling sequence determines which request is serviced. Thus within each priority level there is a second priority structure determined by the polling sequence as follows: Source 1. IE0 (External Int 0) 2. TF0 (Timer 0) 3. IE1 (External Int 1) 4. TF1 (Timer 1) 5. RI+TI (UART) 6. TF2, EXF2 (Timer 2)
SU01521
TF0
0 INT1 1 IT1 IE1
Interrupt Sources
TF1 TI RI TF2, EXF2
Priority Within Level (highest)
(lowest)
Figure 21. Interrupt Sources
Note that the "priority within level" structure is only used to resolve simultaneous requests of the same priority level. The IP and IPH registers contain a number of unimplemented bits. User software should not write 1s to these positions, since they may be used in other 80C51 Family products. How Interrupts Are Handled The interrupt flags are sampled at S5P2 of every machine cycle. The samples are polled during the following machine cycle. If one of the flags was in a set condition at S5P2 of the preceding cycle, the polling cycle will find it and the interrupt system will generate an LCALL to the appropriate service routine, provided this hardware-generated LCALL is not blocked by any of the following conditions: 1. An interrupt of equal or higher priority level is already in progress. 2. The current (polling) cycle is not the final cycle in the execution of the instruction in progress. 3. The instruction in progress is RETI or any write to the IE or IP registers. Any of these three conditions will block the generation of the LCALL to the interrupt service routine. Condition 2 ensures that the instruction in progress will be completed before vectoring to any service routine. Condition 3 ensures that if the instruction in progress is RETI or any access to IE or IP, then at least one more instruction will be executed before any interrupt is vectored to. The polling cycle is repeated with each machine cycle, and the values polled are the values that were present at S5P2 of the previous machine cycle. Note that if an interrupt flag is active but not being responded to for one of the above conditions, if the flag is not still active when the blocking condition is removed, the denied interrupt will not be serviced. In other words, the fact that the interrupt flag was once active but not serviced is not remembered. Every polling cycle is new.
Interrupts
The devices described in this data sheet provide six interrupt sources. These are shown in Figure 21. The External Interrupts INT0 and INT1 can each be either level-activated or transition-activated, depending on bits IT0 and IT1 in Register TCON. The flags that actually generate these interrupts are bits IE0 and IE1 in TCON. When an external interrupt is generated, the flag that generated it is cleared by the hardware when the service routine is vectored to only if the interrupt was transition-activated. If the interrupt was level-activated, then the external requesting source is what controls the request flag, rather than the on-chip hardware. The Timer 0 and Timer 1 Interrupts are generated by TF0 and TF1, which are set by a rollover in their respective Timer/Counter registers (except see Timer 0 in Mode 3). When a timer interrupt is generated, the flag that generated it is cleared by the on-chip hardware when the service routine is vectored to. The Serial Port Interrupt is generated by the logical OR of RI and TI. Neither of these flags is cleared by hardware when the service routine is vectored to. In fact, the service routine will normally have to determine whether it was RI or TI that generated the interrupt, and the bit will have to be cleared in software. All of the bits that generate interrupts can be set or cleared by software, with the same result as though it had been set or cleared by hardware. That is, interrupts can be generated or pending interrupts can be canceled in software. Each of these interrupt sources can be individually enabled or disabled by setting or clearing a bit in Special Function Register IE (Figure 22). IE also contains a global disable bit, EA, which disables all interrupts at once.
2001 Sep 24
31
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
IE
Address = 0A8H Bit Addressable 7 EA 6 -- 5 ET2 4 ES 3 ET1 2 EX1 1 ET0 0 EX0
Reset Value = 0X000000B
Enable Bit = 1 enables the interrupt. Enable Bit = 0 disables it. BIT IE.7 IE.6 IE.5 IE.4 IE.3 IE.2 IE.1 IE.0 SYMBOL EA -- ET2 ES ET1 EX1 ET0 EX0 FUNCTION Global disable bit. If EA = 0, all interrupts are disabled. If EA = 1, each interrupt can be individually enabled or disabled by setting or clearing its enable bit. Not implemented. Reserved for future use. Timer 2 interrupt enable bit. Serial Port interrupt enable bit. Timer 1 interrupt enable bit. External interrupt 1 enable bit. Timer 0 interrupt enable bit. External interrupt 0 enable bit.
SU01522
Figure 22. Interrupt Enable (IE) Register
IP
Address = 0B8H Bit Addressable 7 -- 6 -- 5 PT2 4 PS 3 PT1 2 PX1 1 PT0 0
Reset Value = xx000000B
PX0
Priority Bit = 1 assigns higher priority Priority Bit = 0 assigns lower priority BIT IP.7 IP.6 IP.5 IP.4 IP.3 IP.2 IP.1 IP.0 SYMBOL -- -- PT2 PS PT1 PX1 PT0 PX0 FUNCTION Not implemented, reserved for future use. Not implemented, reserved for future use. Timer 2 interrupt priority bit. Serial Port interrupt priority bit. Timer 1 interrupt priority bit. External interrupt 1 priority bit. Timer 0 interrupt priority bit. External interrupt 0 priority bit. Figure 23. Interrupt Priority (IP) Register
SU01523
IPH
Address = B7H Bit Addressable 7 -- 6 -- 5 PT2H 4 PSH 3 PT1H 2 PX1H 1 PT0H 0
Reset Value = xx000000B
PX0H
Priority Bit = 1 assigns higher priority Priority Bit = 0 assigns lower priority BIT IPH.7 IPH.6 IPH.5 IPH.4 IPH.3 IPH.2 IPH.1 IPH.0 SYMBOL -- -- PT2H PSH PT1H PX1H PT0H PX0H FUNCTION Not implemented, reserved for future use. Not implemented, reserved for future use. Timer 2 interrupt priority bit high. Serial Port interrupt priority bit high. Timer 1 interrupt priority bit high. External interrupt 1 priority bit high. Timer 0 interrupt priority bit high. External interrupt 0 priority bit high. Figure 24. Interrupt Priority HIGH (IPH) Register
SU01524
2001 Sep 24
32
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
......... S5P2 .........
C1 S6
C2
C3
C4
C5
....
.... .... Interrupt Goes Active Interrupt Latched Interrupts Are Polled Long Call to Interrupt Vector Address Interrupt Routine
This is the fastest possible response when C2 is the final cycle of an instruction other than RETI or an access to IE or IP.
SU00546
Figure 25. Interrupt Response Timing Diagram The polling cycle/LCALL sequence is illustrated in Figure 25. Note that if an interrupt of higher priority level goes active prior to S5P2 of the machine cycle labeled C3 in Figure 25, then in accordance with the above rules it will be vectored to during C5 and C6, without any instruction of the lower priority routine having been executed. Thus the processor acknowledges an interrupt request by executing a hardware-generated LCALL to the appropriate servicing routine. In some cases it also clears the flag that generated the interrupt, and in other cases it doesn't. It never clears the Serial Port flag. This has to be done in the user's software. It clears an external interrupt flag (IE0 or IE1) only if it was transition-activated. The hardware-generated LCALL pushes the contents of the Program Counter on to the stack (but it does not save the PSW) and reloads the PC with an address that depends on the source of the interrupt being vectored to, as shown in Table 7. Execution proceeds from that location until the RETI instruction is encountered. The RETI instruction informs the processor that this interrupt routine is no longer in progress, then pops the top two bytes from the stack and reloads the Program Counter. Execution of the interrupted program continues from where it left off. Note that a simple RET instruction would also have returned execution to the interrupted program, but it would have left the interrupt control system thinking an interrupt was still in progress, making future interrupts impossible. External Interrupts The external sources can be programmed to be level-activated or transition-activated by setting or clearing bit IT1 or IT0 in Register TCON. If ITx = 0, external interrupt x is triggered by a detected low at the INTx pin. If ITx = 1, external interrupt x is edge triggered. In this mode if successive samples of the INTx pin show a high in one cycle and a low in the next cycle, interrupt request flag IEx in TCON is set. Flag bit IEx then requests the interrupt. Since the external interrupt pins are sampled once each machine cycle, an input high or low should hold for at least 12 oscillator periods to ensure sampling. If the external interrupt is transition-activated, the external source has to hold the request pin high for at least one cycle, and then hold it low for at least one cycle. This is done to ensure that the transition is seen so that interrupt request flag IEx will be set. IEx will be automatically cleared by the CPU when the service routine is called. If the external interrupt is level-activated, the external source has to hold the request active until the requested interrupt is actually generated. Then it has to deactivate the request before the interrupt service routine is completed, or else another interrupt will be generated. Response Time The INT0 and INT1 levels are inverted and latched into IE0 and IE1 at S5P2 of every machine cycle. The values are not actually polled by the circuitry until the next machine cycle. If a request is active and conditions are right for it to be acknowledged, a hardware subroutine call to the requested service routine will be the next instruction to be executed. The call itself takes two cycles. Thus, a minimum of three complete machine cycles elapse between activation of an external interrupt request and the beginning of execution of the first instruction of the service routine. Figure 25 shows interrupt response timings. A longer response time would result if the request is blocked by one of the 3 previously listed conditions. If an interrupt of equal or higher priority level is already in progress, the additional wait time obviously depends on the nature of the other interrupt's service routine. If the instruction in progress is not in its final cycle, the additional wait time cannot be more the 3 cycles, since the longest instructions (MUL and DIV) are only 4 cycles long, and if the instruction in progress is RETI or an access to IE or IP, the additional wait time cannot be more than 5 cycles (a maximum of one more cycle to complete the instruction in progress, plus 4 cycles to complete the next instruction if the instruction is MUL or DIV). Thus, in a single-interrupt system, the response time is always more than 3 cycles and less than 9 cycles. As previously mentioned, the derivatives described in this data sheet have a four-level interrupt structure. The corresponding registers are IE, IP and IPH. (See Figures 22, 23, and 24.) The IPH (Interrupt Priority High) register makes the four-level interrupt structure possible. The function of the IPH SFR is simple and when combined with the IP SFR determines the priority of each interrupt. The priority of each interrupt is determined as shown in the following table: PRIORITY BITS IPH.x 0 0 1 1 IP.x 0 1 0 1 INTERRUPT PRIORITY LEVEL Level 0 (lowest priority) Level 1 Level 2 Level 3 (highest priority)
2001 Sep 24
33
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
An interrupt will be serviced as long as an interrupt of equal or higher priority is not already being serviced. If an interrupt of equal or higher level priority is being serviced, the new interrupt will wait until it is finished before being serviced. If a lower priority level
interrupt is being serviced, it will be stopped and the new interrupt serviced. When the new interrupt is finished, the lower priority level interrupt that was stopped will be completed.
Table 7.
Interrupt Table
POLLING PRIORITY 1 2 3 4 5 6 REQUEST BITS IE0 TF0 IE1 TF1 RI, TI TF2, EXF2 HARDWARE CLEAR? N (L)1 Y N (L) Y (T) Y N N Y (T)2 VECTOR ADDRESS 03H 0BH 13H 1BH 23H 2BH
SOURCE External interrupt 0 Timer 0 External interrupt 1 Timer 1 UART Timer 2 NOTES: 1. L = Level activated 2. T = Transition activated
Reduced EMI
All port pins have slew rate controlled outputs. This is to limit noise generated by quickly switching output signals. The slew rate is factory set to approximately 10 ns rise and fall times.
Note that bit 2 is not writable and is always read as a zero. This allows the DPS bit to be quickly toggled simply by executing an INC DPTR instruction without affecting the WUPD or LPEP bits.
Reduced EMI Mode
The AO bit (AUXR.0) in the AUXR register when set disables the ALE output. AUXR (8EH)
7 - 6 - 5 - 4 - 3 - 2 - 1 - 0 AO DPS BIT0 AUXR1
DPTR1 DPTR0 DPH (83H) DPL (82H) EXTERNAL DATA MEMORY
AUXR.0
AO
Turns off ALE output. Figure 26.
SU00745A
Dual DPTR
The dual DPTR structure (see Figure 26) enables a way to specify the address of an external data memory location. There are two 16-bit DPTR registers that address the external memory, and a single bit called DPS = AUXR1/bit0 that allows the program code to switch between them. DPTR Instructions The instructions that refer to DPTR refer to the data pointer that is currently selected using the AUXR1/bit 0 register. The six instructions that use the DPTR are as follows: INC DPTR MOV DPTR, #data16 MOV A, @ A+DPTR MOVX A, @ DPTR
5 - 4 LPEP 3 WUPD 2 0 1 - 0 DPS
* New Register Name: AUXR1# * SFR Address: A2H * Reset Value: xxx000x0B
AUXR1 (A2H)
7 - 6 -
Increments the data pointer by 1 Loads the DPTR with a 16-bit constant Move code byte relative to DPTR to ACC Move external RAM (16-bit address) to ACC Move ACC to external RAM (16-bit address) Jump indirect relative to DPTR
MOVX @ DPTR , A JMP @ A + DPTR
Where: DPS = AUXR1/bit0 = Switches between DPTR0 and DPTR1. Select Reg DPTR0 DPTR1 DPS 0 1
The data pointer can be accessed on a byte-by-byte basis by specifying the low or high byte in an instruction which accesses the SFRs. See application note AN458 for more details.
The DPS bit status should be saved by software when switching between DPTR0 and DPTR1.
2001 Sep 24
34
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
ABSOLUTE MAXIMUM RATINGS1, 2, 3
PARAMETER Operating temperature under bias Storage temperature range Voltage on EA/VPP pin to VSS Voltage on any other pin to VSS Maximum IOL per I/O pin RATING 0 to +70 or -40 to +85 -65 to +150 0 to +13.0 -0.5 to +6.5 15 UNIT C C V V mA
Power dissipation (based on package heat transfer limitations, not device power consumption) 1.5 W NOTES: 1. Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any conditions other than those described in the AC and DC Electrical Characteristics section of this specification is not implied. 2. This product includes circuitry specifically designed for the protection of its internal devices from the damaging effects of excessive static charge. Nonetheless, it is suggested that conventional precautions be taken to avoid applying greater than the rated maximum. 3. Parameters are valid over operating temperature range unless otherwise specified. All voltages are with respect to VSS unless otherwise noted.
AC ELECTRICAL CHARACTERISTICS
Tamb = 0C to +70C or -40C to +85C CLOCK FREQUENCY RANGE SYMBOL 1/tCLCL FIGURE 31 PARAMETER Oscillator frequency OPERATING MODE 6-clock 6-clock 12-clock 12-clock POWER SUPPLY VOLTAGE 5 V " 10% 2.7 V to 5.5 V 5 V " 10% 2.7 V to 5.5 V MIN 0 0 0 0 MAX 30 16 33 16 UNIT MHz MHz MHz MHz
2001 Sep 24
35
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
DC ELECTRICAL CHARACTERISTICS
Tamb = 0 C to +70 C or -40 C to +85 C; VCC = 2.7 V to 5.5 V; VSS = 0 V (16 MHz max. CPU clock) SYMBOL PARAMETER TEST CONDITIONS 4.0 V < VCC < 5.5 V 2.7 V < VCC < 4.0 V VIH VIH1 VOL VOL1 VOH VOH1 IIL ITL ILI ICC Input high voltage (ports 0, 1, 2, 3, EA) Input high voltage, XTAL1, RST11 Output low voltage, ports 1, 2, 8 Output low voltage, port 0, ALE, PSEN8, 7 Output high voltage, ports 1, 2, 3 3 - - VCC = 2.7 V; IOL = 1.6 mA2 VCC = 2.7 V; IOL = 3.2 mA2 VCC = 2.7 V; IOH = -20 mA VCC = 4.5 V; IOH = -30 mA Output high voltage (port 0 in external bus VCC = 2.7 V; IOH = -3.2 mA mode), ALE9, PSEN3 Logical 0 input current, ports 1, 2, 3 Logical 1-to-0 transition current, ports 1, 2, 36 Input leakage current, port 0 Power supply current (see Figure 34 and Source Code): Active mode @ 16 MHz Idle mode @ 16 MHz Power-down mode or clock stopped (see Figure 30 for conditions) 12 VRAM RRST CIO RAM keep-alive voltage Internal reset pull-down resistor Pin capacitance10 (except EA) Tamb = 0 C to 70 C Tamb = -40 C to +85 C - - - 1.2 40 - 2 3 - - - 225 15 30 50 mA mA mA mA V k pF VIN = 0.4 V VIN = 2.0 V; See note 4 0.45 < VIN < VCC - 0.3 LIMITS MIN VIL Input low voltage11 -0.5 -0.5 0.2 VCC+0.9 0.7 VCC - - VCC - 0.7 VCC - 0.7 VCC - 0.7 -1 - - TYP1 - - - - - - - - - - - - MAX 0.2 VCC-0.1 0.7 VCC VCC+0.5 VCC+0.5 0.4 0.4 - - - -50 -650 10 V V V V V V V V V mA mA mA UNIT
NOTES: 1. Typical ratings are not guaranteed. Values listed are based on tests conducted on limited number of samples at room temperature. 2. Capacitive loading on ports 0 and 2 may cause spurious noise to be superimposed on the VOLs of ALE and ports 1 and 3. The noise is due to external bus capacitance discharging into the port 0 and port 2 pins when these pins make 1-to-0 transitions during bus operations. In the worst cases (capacitive loading > 100 pF), the noise pulse on the ALE pin may exceed 0.8 V. In such cases, it may be desirable to qualify ALE with a Schmitt Trigger, or use an address latch with a Schmitt Trigger STROBE input. IOL can exceed these conditions provided that no single output sinks more than 5 mA and no more than two outputs exceed the test conditions. 3. Capacitive loading on ports 0 and 2 may cause the VOH on ALE and PSEN to momentarily fall below the VCC-0.7 specification when the address bits are stabilizing. 4. Pins of ports 1, 2 and 3 source a transition current when they are being externally driven from 1 to 0. The transition current reaches its maximum value when VIN is approximately 2 V. 5. See Figures 36 through 39 for ICC test conditions and Figure 34 for ICC vs. Frequency 12-clock mode characteristics: Active mode (operating): ICC = 1.0 mA + 0.9 mA x FREQ.[MHz] Active mode (reset): ICC = 7.0 mA + 0.5 mA x FREQ.[MHz] Idle mode: ICC = 1.0 mA + 0.18 mA x FREQ.[MHz] 6. This value applies to Tamb = 0 C to +70 C. For Tamb = -40 C to +85 C, ITL = -750 mA. 7. Load capacitance for port 0, ALE, and PSEN = 100 pF, load capacitance for all other outputs = 80 pF. 8. Under steady state (non-transient) conditions, IOL must be externally limited as follows: 15 mA (*NOTE: This is 85 C specification.) Maximum IOL per port pin: Maximum IOL per 8-bit port: 26 mA 71 mA Maximum total IOL for all outputs: If IOL exceeds the test condition, VOL may exceed the related specification. Pins are not guaranteed to sink current greater than the listed test conditions. 9. ALE is tested to VOH1, except when ALE is off then VOH is the voltage specification. 10. Pin capacitance is characterized but not tested. Pin capacitance is less than 25 pF. Pin capacitance of ceramic package is less than 15 pF (except EA is 25 pF). 11. To improve noise rejection a nominal 100 ns glitch rejection circuitry has been added to the RST pin, and a nominal 15 ns glitch rejection circuitry has been added to the INT0 and INT1 pins. Previous devices provided only an inherent 5 ns of glitch rejection. 12. Power down mode for 3 V range: Commercial Temperature Range - typ: 0.5 mA, max. 20 mA; Industrial Temperature Range - typ. 1.0 mA, max. 30 mA;
2001 Sep 24
36
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
DC ELECTRICAL CHARACTERISTICS
Tamb = 0 C to +70 C or -40 C to +85 C; VCC = 5 V 10%; VSS = 0 V (30/33 MHz max. CPU clock) SYMBOL PARAMETER TEST CONDITIONS 4.5 V < VCC < 5.5 V - - VCC = 4.5 V; IOL = 1.6 mA2 VCC = 4.5 V; IOL = 3.2 mA2 VCC = 4.5 V; IOH = -30 mA VCC = 4.5 V; IOH = -3.2 mA VIN = 0.4 V VIN = 2.0 V; See note 4 0.45 < VIN < VCC - 0.3 LIMITS MIN VIL VIH VIH1 VOL VOL1 VOH VOH1 IIL ITL ILI ICC Input low voltage11 -0.5 0.2 VCC+0.9 0.7 VCC - - VCC - 0.7 VCC - 0.7 -1 - - - Input high voltage (ports 0, 1, 2, 3, EA) Input high voltage, XTAL1, RST11 Output low voltage, ports 1, 2, 3 8 Output low voltage, port 0, ALE, PSEN 7, 8 Output high voltage, ports 1, 2, 3 3 Output high voltage (port 0 in external bus mode), ALE9, PSEN3 Logical 0 input current, ports 1, 2, 3 Logical 1-to-0 transition current, ports 1, 2, 36 Input leakage current, port 0 Power supply current (see Figure 26): Active mode (see Note 5) Idle mode (see Note 5) Power-down mode or clock stopped (see Figure 39 for conditions) VRAM RRST CIO RAM keep-alive voltage Internal reset pull-down resistor Pin capacitance10 (except EA) Tamb = 0 C to 70 C Tamb = -40 C to +85 C - - - 1.2 40 - 2 3 - - - 225 15 30 50 mA mA V k pF TYP1 - - - - - - - - - - MAX 0.2 VCC-0.1 VCC+0.5 VCC+0.5 0.4 0.4 - - -50 -650 10 V V V V V V V mA mA mA UNIT
NOTES: 1. Typical ratings are not guaranteed. The values listed are at room temperature, 5 V. 2. Capacitive loading on ports 0 and 2 may cause spurious noise to be superimposed on the VOLs of ALE and ports 1 and 3. The noise is due to external bus capacitance discharging into the port 0 and port 2 pins when these pins make 1-to-0 transitions during bus operations. In the worst cases (capacitive loading > 100 pF), the noise pulse on the ALE pin may exceed 0.8 V. In such cases, it may be desirable to qualify ALE with a Schmitt Trigger, or use an address latch with a Schmitt Trigger STROBE input. IOL can exceed these conditions provided that no single output sinks more than 5 mA and no more than two outputs exceed the test conditions. 3. Capacitive loading on ports 0 and 2 may cause the VOH on ALE and PSEN to momentarily fall below the VCC-0.7 specification when the address bits are stabilizing. 4. Pins of ports 1, 2 and 3 source a transition current when they are being externally driven from 1 to 0. The transition current reaches its maximum value when VIN is approximately 2 V. 5. See Figures 36 through 39 for ICC test conditions and Figure 34 for ICC vs. Frequency. 12-clock mode characteristics: Active mode (operating): ICC(MAX) = 1.0 mA + 0.9 mA x FREQ.[MHz] Active mode (reset): ICC(MAX) = 7.0 mA + 0.5 mA x FREQ.[MHz] Idle mode: ICC(MAX) = 1.0 mA + 0.18 mA x FREQ.[MHz] 6. This value applies to Tamb = 0C to +70C. For Tamb = -40C to +85C, ITL = -750 . 7. Load capacitance for port 0, ALE, and PSEN = 100 pF, load capacitance for all other outputs = 80 pF. 8. Under steady state (non-transient) conditions, IOL must be externally limited as follows: Maximum IOL per port pin: 15 mA (*NOTE: This is 85 C specification.) 26 mA Maximum IOL per 8-bit port: Maximum total IOL for all outputs: 71 mA If IOL exceeds the test condition, VOL may exceed the related specification. Pins are not guaranteed to sink current greater than the listed test conditions. 9. ALE is tested to VOH1, except when ALE is off then VOH is the voltage specification. 10. Pin capacitance is characterized but not tested. Pin capacitance is less than 25 pF. Pin capacitance of ceramic package is less than 15 pF (except EA is 25 pF). 11. To improve noise rejection a nominal 100 ns glitch rejection circuitry has been added to the RST pin, and a nominal 15 ns glitch rejection circuitry has been added to the INT0 and INT1 pins. Previous devices provided only an inherent 5 ns of glitch rejection.
2001 Sep 24
37
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
AC ELECTRICAL CHARACTERISTICS (12-CLOCK MODE, 5 V 10% OPERATION)
Tamb = 0 C to +70 C or -40 C to +85 C ; VCC = 5 V 10%, VSS = 0 V1,2,3,4 Symbol Figure Parameter Limits MIN 1/tCLCL tLHLL tAVLL tLLAX tLLIV tLLPL tPLPH tPLIV tPXIX tPXIZ tAVIV tPLAZ tRLRH tWLWH tRLDV tRHDX tRHDZ tLLDV tAVDV tLLWL tAVWL tQVWX tWHQX tQVWH tRLAZ tWHLH tCHCX tCLCX tCLCH tCHCL tXLXL tQVXH tXHQX tXHDX tXHDV 31 27 27 27 27 27 27 27 27 27 27 27 28 29 28 28 28 28 28 28, 29 28, 29 29 29 29 28 28, 29 31 31 31 31 30 30 30 30 30 Oscillator frequency ALE pulse width Address valid to ALE low Address hold after ALE low ALE low to valid instruction in ALE low to PSEN low PSEN pulse width PSEN low to valid instruction in Input instruction hold after PSEN Input instruction float after PSEN Address to valid instruction in PSEN low to address float RD pulse width WR pulse width RD low to valid data in Data hold after RD Data float after RD ALE low to valid data in Address to valid data in ALE low to RD or WR low Address valid to WR low or RD low Data valid to WR transition Data hold after WR Data valid to WR high RD low to address float RD or WR high to ALE high High time Low time Rise time Fall time Serial port clock cycle time Output data setup to clock rising edge Output data hold after clock rising edge Input data hold after clock rising edge Clock rising edge to input data valid 12 tCLCL 10 tCLCL -25 2 tCLCL -15 0 10 tCLCL -133 tCLCL -10 0.32 tCLCL 0.32 tCLCL 3 tCLCL -15 4 tCLCL -15 tCLCL -25 tCLCL -15 7 tCLCL -5 0 tCLCL +10 tCLCL - tCLCX tCLCL - tCHCX 5 5 750 600 110 0 492 52.5 0 2 tCLCL -10 8 tCLCL -35 9 tCLCL -35 3 tCLCL +15 172.5 235 37.5 47.5 432.5 0 72.5 6 tCLCL -20 6 tCLCL -20 5 tCLCL -35 0 115 465 527.5 202.5 0 tCLCL -10 5 tCLCL -35 10 355 355 277.5 tCLCL -10 3 tCLCL -10 3 tCLCL -35 0 52.5 277.5 10 0 2 tCLCL-8 tCLCL -13 tCLCL -20 4 tCLCL -35 52.5 177.5 152.5 16 MHz Clock MAX 33 117 49.5 42.5 215 MIN MAX MHz ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns Unit
Data Memory
External Clock
Shift register
NOTES: 1. Parameters are valid over operating temperature range unless otherwise specified. 2. Load capacitance for port 0, ALE, and PSEN = 100 pF, load capacitance for all outputs = 80 pF 3. Interfacing the microcontroller to devices with float time up to 45 ns is permitted. This limited bus contention will not cause damage to port 0 drivers. 4. Parts are guaranteed by design to operate down to 0 Hz.
2001 Sep 24
38
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
AC ELECTRICAL CHARACTERISTICS (12-CLOCK MODE, 2.7 V TO 5.5 V OPERATION)
Tamb = 0 C to +70 C or -40 C to +85 C ; VCC = 2.7 V to 5.5 V, VSS = 0 V1,2,3,4 Symbol Figure Parameter Limits MIN 1/tCLCL tLHLL tAVLL tLLAX tLLIV tLLPL tPLPH tPLIV tPXIX tPXIZ tAVIV tPLAZ tRLRH tWLWH tRLDV tRHDX tRHDZ tLLDV tAVDV tLLWL tAVWL tQVWX tWHQX tQVWH tRLAZ tWHLH tCHCX tCLCX tCLCH tCHCL tXLXL tQVXH tXHQX tXHDX tXHDV 31 27 27 27 27 27 27 27 27 27 27 27 28 29 28 28 28 28 28 28, 29 28, 29 29 29 29 28 28, 29 31 31 31 31 30 30 30 30 30 Oscillator frequency ALE pulse width Address valid to ALE low Address hold after ALE low ALE low to valid instruction in ALE low to PSEN low PSEN pulse width PSEN low to valid instruction in Input instruction hold after PSEN Input instruction float after PSEN Address to valid instruction in PSEN low to address float RD pulse width WR pulse width RD low to valid data in Data hold after RD Data float after RD ALE low to valid data in Address to valid data in ALE low to RD or WR low Address valid to WR low or RD low Data valid to WR transition Data hold after WR Data valid to WR high RD low to address float RD or WR high to ALE high High time Low time Rise time Fall time Serial port clock cycle time Output data setup to clock rising edge Output data hold after clock rising edge Input data hold after clock rising edge Clock rising edge to input data valid 12 tCLCL 10 tCLCL -25 2 tCLCL -15 0 10 tCLCL -133 tCLCL -15 0.32 tCLCL 0.32 tCLCL 3 tCLCL -20 4 tCLCL -20 tCLCL -30 tCLCL -20 7 tCLCL -10 0 tCLCL +15 tCLCL - tCLCX tCLCL - tCHCX 5 5 750 600 110 0 492 47.5 0 2 tCLCL -20 8 tCLCL -55 9 tCLCL -50 3 tCLCL +20 167.5 230 32.5 42.5 427.5 0 77.5 6 tCLCL -25 6 tCLCL -25 5 tCLCL -50 0 105 445 512.5 207.5 0 tCLCL -10 5 tCLCL -50 10 350 350 262.5 tCLCL -15 3 tCLCL -15 3 tCLCL -55 0 52.5 262.5 10 0 2tCLCL-10 tCLCL -15 tCLCL -25 4 tCLCL -55 47.5 172.5 132.5 MAX 16 115 47.5 37.5 195 16 MHz Clock MIN MAX MHz ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns Unit
Data Memory
External Clock
Shift register
NOTES: 1. Parameters are valid over operating temperature range unless otherwise specified. 2. Load capacitance for port 0, ALE, and PSEN = 100 pF, load capacitance for all outputs = 80 pF 3. Interfacing the microcontroller to devices with float time up to 45 ns is permitted. This limited bus contention will not cause damage to port 0 drivers. 4. Parts are guaranteed by design to operate down to 0 Hz.
2001 Sep 24
39
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
AC ELECTRICAL CHARACTERISTICS (6-CLOCK MODE, 5 V 10% OPERATION)
Tamb = 0 C to +70 C or -40 C to +85 C ; VCC = 5 V 10%, VSS = 0 V1,2,3,4,5 Symbol Figure Parameter Limits MIN 1/tCLCL tLHLL tAVLL tLLAX tLLIV tLLPL tPLPH tPLIV tPXIX tPXIZ tAVIV 31 27 27 27 27 27 27 27 27 27 27 Oscillator frequency ALE pulse width Address valid to ALE low Address hold after ALE low ALE low to valid instruction in ALE low to PSEN low PSEN pulse width PSEN low to valid instruction in Input instruction hold after PSEN Input instruction float after PSEN Address to valid instruction in PSEN low to address float RD pulse width WR pulse width RD low to valid data in Data hold after RD Data float after RD ALE low to valid data in Address to valid data in ALE low to RD or WR low Address valid to WR low or RD low Data valid to WR transition Data hold after WR Data valid to WR high RD low to address float RD or WR high to ALE high High time Low time Rise time Fall time Serial port clock cycle time Output data setup to clock rising edge Output data hold after clock rising edge Input data hold after clock rising edge Clock rising edge to input data valid 6 tCLCL 5 tCLCL -25 tCLCL -15 0 5 tCLCL -133 0.5 tCLCL -10 0.4 tCLCL 0.4 tCLCL 1.5 tCLCL -15 2 tCLCL -15 0.5 tCLCL -25 0.5 tCLCL -15 3.5 tCLCL -5 0 0.5 tCLCL +10 tCLCL - tCLCX tCLCL - tCHCX 5 5 375 287.5 47.5 0 179.5 21.25 0 tCLCL -10 4 tCLCL -35 4.5 tCLCL -35 1.5 tCLCL +15 78.75 110 6.25 16.25 213.75 0 41.25 3 tCLCL -20 3 tCLCL -20 2.5 tCLCL -35 0 52.5 215 246.25 108.75 0 0.5 tCLCL -10 2.5 tCLCL -35 10 167.5 167.5 121.25 0.5 tCLCL -10 1.5 tCLCL -10 1.5 tCLCL -35 0 21.25 121.25 10 0 tCLCL-8 0.5 tCLCL -13 0.5 tCLCL -20 2 tCLCL -35 21.25 83.75 58.75 16 MHz Clock MAX 30 54.5 18.25 11.25 90 MIN MAX MHz ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns Unit
tPLAZ 27 Data Memory tRLRH tWLWH tRLDV tRHDX tRHDZ tLLDV tAVDV tLLWL tAVWL tQVWX tWHQX tQVWH tRLAZ 28 29 28 28 28 28 28 28, 29 28, 29 29 29 29 28
tWHLH 28, 29 External Clock tCHCX tCLCX tCLCH 31 31 31
tCHCL 31 Shift register tXLXL tQVXH tXHQX tXHDX tXHDV 30 30 30 30 30
NOTES: 1. Parameters are valid over operating temperature range unless otherwise specified. 2. Load capacitance for port 0, ALE, and PSEN=100 pF, load capacitance for all outputs = 80 pF 3. Interfacing the microcontroller to devices with float time up to 45ns is permitted. This limited bus contention will not cause damage to port 0 drivers. 4. Parts are guaranteed by design to operate down to 0 Hz. 5. Data shown in the table are the best mathematical models for the set of measured values obtained in tests. If a particular parameter calculated at a customer specified frequency has a negative value, it should be considered equal to zero.
2001 Sep 24
40
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
AC ELECTRICAL CHARACTERISTICS (6-CLOCK MODE, 2.7 V TO 5.5 V OPERATION)
Tamb = 0 C to +70 C or -40 C to +85 C ; VCC=2.7 V to 5.5 V, VSS = 0 V1,2,3,4,5 Symbol Figure Parameter Limits MIN 1/tCLCL tLHLL tAVLL tLLAX tLLIV tLLPL tPLPH tPLIV tPXIX tPXIZ tAVIV 31 27 27 27 27 27 27 27 27 27 27 Oscillator frequency ALE pulse width Address valid to ALE low Address hold after ALE low ALE low to valid instruction in ALE low to PSEN low PSEN pulse width PSEN low to valid instruction in Input instruction hold after PSEN Input instruction float after PSEN Address to valid instruction in PSEN low to address float RD pulse width WR pulse width RD low to valid data in Data hold after RD Data float after RD ALE low to valid data in Address to valid data in ALE low to RD or WR low Address valid to WR low or RD low Data valid to WR transition Data hold after WR Data valid to WR high RD low to address float RD or WR high to ALE high High time Low time Rise time Fall time Serial port clock cycle time Output data setup to clock rising edge Output data hold after clock rising edge Input data hold after clock rising edge Clock rising edge to input data valid 6 tCLCL 5 tCLCL -25 tCLCL -15 0 5 tCLCL -133 0.5 tCLCL -15 0.4 tCLCL 0.4 tCLCL 1.5 tCLCL -20 2 tCLCL -20 0.5 tCLCL -30 0.5 tCLCL -20 3.5 tCLCL -10 0 0.5 tCLCL +15 tCLCL - tCLCX tCLCL - tCHCX 5 5 375 287.5 47.5 0 179.5 16.25 0 tCLCL -20 4 tCLCL -55 4.5 tCLCL -50 1.5 tCLCL +20 73.75 105 1.25 11.25 208.75 0 46.25 3 tCLCL -25 3 tCLCL -25 2.5 tCLCL -50 0 42.5 195 231.25 113.75 0 0.5 tCLCL -10 2.5 tCLCL -50 10 162.5 162.5 106.25 0.5 tCLCL -15 1.5 tCLCL -15 1.5 tCLCL -55 0 21.25 101.25 10 0 tCLCL-10 0.5 tCLCL -15 0.5 tCLCL -25 2 tCLCL -55 16.25 78.75 38.75 MAX 16 52.5 16.25 6.25 70 16 MHz Clock MIN MAX MHz ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns Unit
tPLAZ 27 Data Memory tRLRH tWLWH tRLDV tRHDX tRHDZ tLLDV tAVDV tLLWL tAVWL tQVWX tWHQX tQVWH tRLAZ 28 29 28 28 28 28 28 28, 29 28, 29 29 29 29 28
tWHLH 28, 29 External Clock tCHCX tCLCX tCLCH 31 31 31
tCHCL 31 Shift register tXLXL tQVXH tXHQX tXHDX tXHDV 30 30 30 30 30
NOTES: 1. Parameters are valid over operating temperature range unless otherwise specified. 2. Load capacitance for port 0, ALE, and PSEN=100 pF, load capacitance for all outputs = 80 pF 3. Interfacing the microcontroller to devices with float time up to 45ns is permitted. This limited bus contention will not cause damage to port 0 drivers. 4. Parts are guaranteed by design to operate down to 0 Hz. 5. Data shown in the table are the best mathematical models for the set of measured values obtained in tests. If a particular parameter calculated at a customer specified frequency has a negative value, it should be considered equal to zero.
2001 Sep 24
41
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
EXPLANATION OF THE AC SYMBOLS
Each timing symbol has five characters. The first character is always `t' (= time). The other characters, depending on their positions, indicate the name of a signal or the logical status of that signal. The designations are: A - Address C - Clock D - Input data H - Logic level high I - Instruction (program memory contents) L - Logic level low, or ALE P - PSEN Q - Output data R - RD signal t - Time V - Valid W - WR signal X - No longer a valid logic level Z - Float Examples: tAVLL = Time for address valid to ALE low. tLLPL =Time for ALE low to PSEN low.
tLHLL
ALE
tAVLL
tLLPL
PSEN
tPLPH tLLIV tPLIV tPLAZ tPXIX
INSTR IN
tLLAX
tPXIZ
PORT 0
A0-A7
A0-A7
tAVIV
PORT 2 A0-A15 A8-A15
SU00006
Figure 27. External Program Memory Read Cycle
ALE
tWHLH
PSEN
tLLDV tLLWL
RD
tRLRH
tAVLL
PORT 0
tLLAX tRLAZ
A0-A7 FROM RI OR DPL
tRLDV tRHDX
DATA IN
tRHDZ
A0-A7 FROM PCL
INSTR IN
tAVWL tAVDV
PORT 2 P2.0-P2.7 OR A8-A15 FROM DPF A0-A15 FROM PCH
SU00025
Figure 28. External Data Memory Read Cycle
2001 Sep 24
42
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
ALE
tWHLH
PSEN
tLLWL
WR
tWLWH
tAVLL
PORT 0
tLLAX
tQVWX tQVWH
tWHQX
A0-A7 FROM RI OR DPL
DATA OUT
A0-A7 FROM PCL
INSTR IN
tAVWL
PORT 2
P2.0-P2.7 OR A8-A15 FROM DPF
A0-A15 FROM PCH
SU00026
Figure 29. External Data Memory Write Cycle
INSTRUCTION ALE
0
1
2
3
4
5
6
7
8
tXLXL
CLOCK
tQVXH
OUTPUT DATA 0 WRITE TO SBUF
tXHQX
1 2 3 4 5 6 7
tXHDV
INPUT DATA VALID CLEAR RI VALID
tXHDX
SET TI VALID VALID VALID VALID VALID VALID
SET RI
SU00027
Figure 30. Shift Register Mode Timing
VCC-0.5 0.45V
0.7VCC 0.2VCC-0.1
tCHCL
tCLCX tCLCL
tCHCX tCLCH
SU00009
Figure 31. External Clock Drive
2001 Sep 24
43
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
VCC-0.5
0.2VCC+0.9 VLOAD 0.2VCC-0.1
VLOAD+0.1V VLOAD-0.1V
TIMING REFERENCE POINTS
VOH-0.1V VOL+0.1V
0.45V
NOTE: AC inputs during testing are driven at VCC -0.5 for a logic `1' and 0.45V for a logic `0'. Timing measurements are made at VIH min for a logic `1' and VIL max for a logic `0'.
NOTE: For timing purposes, a port is no longer floating when a 100mV change from load voltage occurs, and begins to float when a 100mV change from the loaded VOH/VOL level occurs. IOH/IOL 20mA.
SU00717
SU00718
Figure 32. AC Testing Input/Output
Figure 33. Float Waveform
35 30
25 ICC(mA)
MAX ACTIVE MODE ICCMAX = 0.9 X FREQ. + 1.0
20
15
TYP ACTIVE MODE
10 MAX IDLE MODE 5 TYP IDLE MODE 4 8 12 16 20 24 28 32 36
FREQ AT XTAL1 (MHz)
SU01486
Figure 34. ICC vs. FREQ for 12-clock operation Valid only within frequency specifications of the specified operating voltage
/* ## as31 version V2.10 / *js* / ## ## ## source file: idd_ljmp1.asm ## list file: idd_ljmp1.lst created Fri Apr 20 15:51:40 2001 ## ########################################################## #0000 # AUXR equ 08Eh #0000 # CKCON equ 08Fh # # #0000 # org 0 # # LJMP_LABEL: 0000 /75;/8E;/01; # MOV AUXR,#001h ; turn off ALE 0003 /02;/FF;/FD; # LJMP LJMP_LABEL ; jump to end of address space 0005 /00; # NOP # #FFFD # org 0fffdh # # LJMP_LABEL: # FFFD /02;/FD;FF; # LJMP LJMP_LABEL #; NOP # # */" Figure 35. Source code used in measuring IDD operational
SU01499
2001 Sep 24
44
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
VCC ICC VCC VCC P0 EA (NC) CLOCK SIGNAL XTAL2 XTAL1 VSS (NC) CLOCK SIGNAL XTAL2 XTAL1 VSS VCC RST P0 EA VCC
VCC ICC
VCC
RST
SU00719
SU00720
Figure 36. ICC Test Condition, Active Mode All other pins are disconnected
Figure 37. ICC Test Condition, Idle Mode All other pins are disconnected
VCC-0.5 0.45V
0.7VCC 0.2VCC-0.1
tCHCL
tCLCX tCLCL
tCHCX tCLCH
SU00009
Figure 38. Clock Signal Waveform for ICC Tests in Active and Idle Modes tCLCH = tCHCL = 5ns
VCC ICC VCC RST P0 EA (NC) XTAL2 XTAL1 VSS VCC
SU00016
Figure 39. ICC Test Condition, Power Down Mode All other pins are disconnected. VCC = 2 V to 5.5 V
2001 Sep 24
45
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
EPROM CHARACTERISTICS
The OTP devices described in this data sheet can be programmed by using a modified Improved Quick-Pulse ProgrammingTM algorithm. It differs from older methods in the value used for VPP (programming supply voltage) and in the width and number of the ALE/PROG pulses. The family contains two signature bytes that can be read and used by an EPROM programming system to identify the device. The signature bytes identify the device as being manufactured by Philips. Table 8 shows the logic levels for reading the signature byte, and for programming the program memory, the encryption table, and the security bits. The circuit configuration and waveforms for quick-pulse programming are shown in Figures 40 and 41. Figure 42 shows the circuit configuration for normal program memory verification.
device. The VPP source should be well regulated and free of glitches and overshoot. Program Verification If security bits 2 and 3 have not been programmed, the on-chip program memory can be read out for program verification. The address of the program memory locations to be read is applied to ports 1 and 2 as shown in Figure 42. The other pins are held at the `Verify Code Data' levels indicated in Table 8. The contents of the address location will be emitted on port 0. External pull-ups are required on port 0 for this operation. If the 64 byte encryption table has been programmed, the data presented at port 0 will be the exclusive NOR of the program byte with one of the encryption bytes. The user will have to know the encryption table contents in order to correctly decode the verification data. The encryption table itself cannot be read out. Reading the Signature bytes The signature bytes are read by the same procedure as a normal verification of locations 030h and 031h, except that P3.6 and P3.7 need to be pulled to a logic low. The values are: (030h) = 15h; indicates manufacturer (Philips) (031h) = 92h / 97h / BBh / BDh; indicates 87C51X2 / 52X2 / 54X2 / 58X2.
Quick-Pulse Programming
The setup for microcontroller quick-pulse programming is shown in Figure 40. Note that the device is running with a 4 to 6 MHz oscillator. The reason the oscillator needs to be running is that the device is executing internal address and program data transfers. The address of the EPROM location to be programmed is applied to ports 1 and 2, as shown in Figure 40. The code byte to be programmed into that location is applied to port 0. RST, PSEN and pins of ports 2 and 3 specified in Table 8 are held at the `Program Code Data' levels indicated in Table 8. The ALE/PROG is pulsed low 5 times as shown in Figure 41. To program the encryption table, repeat the 5 pulse programming sequence for addresses 0 through 1FH, using the `Pgm Encryption Table' levels. Do not forget that after the encryption table is programmed, verification cycles will produce only encrypted data. To program the security bits, repeat the 5 pulse programming sequence using the `Pgm Security Bit' levels. After one security bit is programmed, further programming of the code memory and encryption table is disabled. However, the other security bits can still be programmed. Note that the EA/VPP pin must not be allowed to go above the maximum specified VPP level for any amount of time. Even a narrow glitch above that voltage can cause permanent damage to the
Program/Verify Algorithms
Any algorithm in agreement with the conditions listed in Table 8, and which satisfies the timing specifications, is suitable.
Security Bits
With none of the security bits programmed the code in the program memory can be verified. If the encryption table is programmed, the code will be encrypted when verified. When only security bit 1 (see Table 9) is programmed, MOVC instructions executed from external program memory are disabled from fetching code bytes from the internal memory, EA is latched on Reset and all further programming of the EPROM is disabled. When security bits 1 and 2 are programmed, in addition to the above, verify mode is disabled. When all three security bits are programmed, all of the conditions above apply and all external program memory execution is disabled.
Encryption Array
64 bytes of encryption array are initially unprogrammed (all 1s).
Table 8. EPROM Programming Modes
MODE Read signature Program code data Verify code data Pgm encryption table Pgm security bit 1 Pgm security bit 2 Pgm security bit 3 RST 1 1 1 1 1 1 1 PSEN 0 0 0 0 0 0 0 ALE/PROG 1 0* 1 0* 0* 0* 0* EA/VPP 1 VPP 1 VPP VPP VPP VPP P2.7 0 1 0 1 1 1 0 P2.6 0 0 0 0 1 1 1 P3.7 0 1 1 1 1 0 0 P3.6 0 1 1 0 1 0 1
NOTES: 1. `0' = Valid low for that pin, `1' = valid high for that pin. 2. VPP = 12.75 V 0.25 V. 3. VCC = 5 V10% during programming and verification. * ALE/PROG receives 5 programming pulses for code data (also for user array; 5 pulses for encryption or security bits) while VPP is held at 12.75 V. Each programming pulse is low for 100 s (10 s) and high for a minimum of 10 s. TMTrademark phrase of Intel Corporation. 2001 Sep 24 46
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
Table 9. Program Security Bits for EPROM Devices
PROGRAM LOCK BITS1, 2 SB1 1 2 U P SB2 U U SB3 U U PROTECTION DESCRIPTION No Program Security features enabled. (Code verify will still be encrypted by the Encryption Array if programmed.) MOVC instructions executed from external program memory are disabled from fetching code bytes from internal memory, EA is sampled and latched on Reset, and further programming of the EPROM is disabled. Same as 2, also verify is disabled. Same as 3, external execution is disabled. Internal data RAM is not accessible.
3 4
P P
P P
U P
NOTES: 1. P - programmed. U - unprogrammed. 2. Any other combination of the security bits is not defined.
+5V
A0-A7 1 1 1
P1 RST P3.6 P3.7 OTP XTAL2
VCC P0 PGM DATA +12.75V 5 PULSES TO GROUND 0 1 0 A8-A12
EA/VPP ALE/PROG PSEN P2.7 P2.6
4-6MHz XTAL1 VSS
P2.0-P2.5
SU01488
Figure 40. Programming Configuration
5 PULSES 1 ALE/PROG: 0 1 2 3 4 5
SEE EXPLODED VIEW BELOW tGHGL = 10s MIN tGLGH = 100s10s 1 ALE/PROG: 0 1
SU00875
Figure 41. PROG Waveform
2001 Sep 24
47
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
+5V
VCC A0-A7 1 1 1 P1 RST P3.6 P3.7 OTP XTAL2 4-6MHz XTAL1 VSS ALE/PROG PSEN P2.7 P2.6 P2.0-P2.5 P0 PGM DATA 1 1 0 0 ENABLE 0 A8-A12
EA/VPP
SU01489
Figure 42. Program Verification
PROGRAMMING AND VERIFICATION CHARACTERISTICS
Tamb = 21 C to +27 C, VCC = 5 V10%, VSS = 0 V (See Figure 43) SYMBOL VPP IPP 1/tCLCL tAVGL tGHAX tDVGL tGHDX tEHSH tSHGL tGHSL tGLGH tAVQV tELQZ tEHQZ tGHGL NOTE: 1. Not tested. Programming supply voltage Programming supply current Oscillator frequency Address setup to PROG low Address hold after PROG Data setup to PROG low Data hold after PROG P2.7 (ENABLE) high to VPP VPP setup to PROG low VPP hold after PROG PROG width Address to data valid ENABLE low to data valid Data float after ENABLE PROG high to PROG low 0 10 4 48tCLCL 48tCLCL 48tCLCL 48tCLCL 48tCLCL 10 10 90 110 48tCLCL 48tCLCL 48tCLCL s s s s PARAMETER MIN 12.5 MAX 13.0 50 1 6 UNIT V mA MHz
2001 Sep 24
48
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
PROGRAMMING* P1.0-P1.7 P2.0-P2.5 P3.4 (A0 - A12) ADDRESS
VERIFICATION* ADDRESS
tAVQV
DATA IN DATA OUT
PORT 0 P0.0 - P0.7 (D0 - D7)
tDVGL tAVGL
ALE/PROG
tGHDX tGHAX
tGLGH tSHGL
tGHGL tGHSL
LOGIC 1 EA/VPP LOGIC 0
LOGIC 1
tEHSH
P2.7 **
tELQV
tEHQZ
SU01414
NOTES: * FOR PROGRAMMING CONFIGURATION SEE FIGURE 40.
FOR VERIFICATION CONDITIONS SEE FIGURE 42. ** SEE TABLE 8.
Figure 43. Programming and Verification
MASK ROM DEVICES Security Bits
With none of the security bits programmed the code in the program memory can be verified. If the encryption table is programmed, the code will be encrypted when verified. When only security bit 1 (see Table 10) is programmed, MOVC instructions executed from external program memory are disabled from fetching code bytes from the internal memory, EA is latched on Reset and all further programming of the EPROM is disabled. When security bits 1 and 2 are programmed, in addition to the above, verify mode is disabled.
Encryption Array
64 bytes of encryption array are initially unprogrammed (all 1s).
Table 10. Program Security Bits
PROGRAM LOCK BITS1, 2 SB1 1 2 U P SB2 U U PROTECTION DESCRIPTION No Program Security features enabled. (Code verify will still be encrypted by the Encryption Array if programmed.) MOVC instructions executed from external program memory are disabled from fetching code bytes from internal memory, EA is sampled and latched on Reset, and further programming of the EPROM is disabled.
NOTES: 1. P - programmed. U - unprogrammed. 2. Any other combination of the security bits is not defined.
2001 Sep 24
49
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
80C51X2 ROM CODE SUBMISSION
When submitting a ROM code for the 80C51X2, the following must be specified: 1. 4 kbyte user ROM data 2. 64 byte ROM encryption key 3. ROM security bits. ADDRESS 0000H to 0FFFH 1000H to 103FH 1040H 1040H CONTENT DATA KEY SEC SEC BIT(S) 7:0 7:0 0 1 COMMENT User ROM Data ROM Encryption Key ROM Security Bit 1 ROM Security Bit 2
Security Bit 1: When programmed, this bit has two effects on masked ROM parts: 1. External MOVC is disabled, and 2. EA is latched on Reset. Security Bit 2: When programmed, this bit inhibits Verify User ROM. NOTE: Security Bit 2 cannot be enabled unless Security Bit 1 is enabled. If the ROM Code file does not include the options, the following information must be included with the ROM code. For each of the following, check the appropriate box, and send to Philips along with the code: Security Bit #1: Security Bit #2: Encryption:
V V V
Enabled Enabled No
V V V
Disabled Disabled Yes If Yes, must send key file.
80C52X2 ROM CODE SUBMISSION
When submitting a ROM code for the 80C52X2, the following must be specified: 1. 8 kbyte user ROM data 2. 64 byte ROM encryption key 3. ROM security bits. ADDRESS 0000H to 1FFFH 2000H to 203FH 2040H 2040H CONTENT DATA KEY SEC SEC BIT(S) 7:0 7:0 0 1 COMMENT User ROM Data ROM Encryption Key ROM Security Bit 1 ROM Security Bit 2
Security Bit 1: When programmed, this bit has two effects on masked ROM parts: 1. External MOVC is disabled, and 2. EA is latched on Reset. Security Bit 2: When programmed, this bit inhibits Verify User ROM. NOTE: Security Bit 2 cannot be enabled unless Security Bit 1 is enabled. If the ROM Code file does not include the options, the following information must be included with the ROM code. For each of the following, check the appropriate box, and send to Philips along with the code: Security Bit #1: Security Bit #2: Encryption:
V V V
Enabled Enabled No
V V V
Disabled Disabled Yes If Yes, must send key file.
2001 Sep 24
50
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
80C54X2 ROM CODE SUBMISSION
When submitting a ROM code for the 80C54X2, the following must be specified: 1. 16 kbyte user ROM data 2. 64 byte ROM encryption key 3. ROM security bits. ADDRESS 0000H to 3FFFH 4000H to 403FH 4040H CONTENT DATA KEY SEC BIT(S) 7:0 7:0 0 COMMENT User ROM Data ROM Encryption Key FFH = no encryption ROM Security Bit 1 0 = enable security 1 = disable security ROM Security Bit 2 0 = enable security 1 = disable security
4040H
SEC
1
Security Bit 1: When programmed, this bit has two effects on masked ROM parts: 1. External MOVC is disabled, and 2. EA is latched on Reset. Security Bit 2: When programmed, this bit inhibits Verify User ROM. NOTE: Security Bit 2 cannot be enabled unless Security Bit 1 is enabled.
If the ROM Code file does not include the options, the following information must be included with the ROM code. For each of the following, check the appropriate box, and send to Philips along with the code: Security Bit #1: Security Bit #2: Encryption:
V V V
Enabled Enabled No
V V V
Disabled Disabled Yes If Yes, must send key file.
2001 Sep 24
51
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
80C58X2 ROM CODE SUBMISSION
When submitting a ROM code for the 80C58X2, the following must be specified: 1. 32 kbyte user ROM data 2. 64 byte ROM encryption key 3. ROM security bits. ADDRESS 0000H to 7FFFH 8000H to 803FH 8040H CONTENT DATA KEY SEC BIT(S) 7:0 7:0 0 COMMENT User ROM Data ROM Encryption Key FFH = no encryption ROM Security Bit 1 0 = enable security 1 = disable security ROM Security Bit 2 0 = enable security 1 = disable security
8040H
SEC
1
Security Bit 1: When programmed, this bit has two effects on masked ROM parts: 1. External MOVC is disabled, and 2. EA is latched on Reset. Security Bit 2: When programmed, this bit inhibits Verify User ROM. NOTE: Security Bit 2 cannot be enabled unless Security Bit 1 is enabled.
If the ROM Code file does not include the options, the following information must be included with the ROM code. For each of the following, check the appropriate box, and send to Philips along with the code: Security Bit #1: Security Bit #2: Encryption:
V V V
Enabled Enabled No
V V V
Disabled Disabled Yes If Yes, must send key file.
2001 Sep 24
52
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
DIP40: plastic dual in-line package; 40 leads (600 mil)
SOT129-1
2001 Sep 24
53
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
PLCC44: plastic leaded chip carrier; 44 leads
SOT187-2
2001 Sep 24
54
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
LQFP44 (available soon): plastic low profile quad flat package; 44 leads; body 10 x 10 x 1.4 mm SOT389-1
2001 Sep 24
55
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
REVISION HISTORY
Date 2001 Sep 24 CPCN 9397 750 08895 Description Initial release
2001 Sep 24
56
Philips Semiconductors
Preliminary data
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)
80C3xX2; 80C5xX2; 87C5xX2
Data sheet status
Data sheet status [1] Objective data Preliminary data Product status [2] Development Qualification Definitions This data sheet contains data from the objective specification for product development. Philips Semiconductors reserves the right to change the specification in any manner without notice. This data sheet contains data from the preliminary specification. Supplementary data will be published at a later date. Philips Semiconductors reserves the right to change the specification without notice, in order to improve the design and supply the best possible product. This data sheet contains data from the product specification. Philips Semiconductors reserves the right to make changes at any time in order to improve the design, manufacturing and supply. Changes will be communicated according to the Customer Product/Process Change Notification (CPCN) procedure SNW-SQ-650A.
Product data
Production
[1] Please consult the most recently issued data sheet before initiating or completing a design. [2] The product status of the device(s) described in this data sheet may have changed since this data sheet was published. The latest information is available on the Internet at URL http://www.semiconductors.philips.com.
Definitions
Short-form specification -- The data in a short-form specification is extracted from a full data sheet with the same type number and title. For detailed information see the relevant data sheet or data handbook. Limiting values definition -- Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 60134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability. Application information -- Applications that are described herein for any of these products are for illustrative purposes only. Philips Semiconductors make no representation or warranty that such applications will be suitable for the specified use without further testing or modification.
Disclaimers
Life support -- These products are not designed for use in life support appliances, devices or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips Semiconductors customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from such application. Right to make changes -- Philips Semiconductors reserves the right to make changes, without notice, in the products, including circuits, standard cells, and/or software, described or contained herein in order to improve design and/or performance. Philips Semiconductors assumes no responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright, or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless otherwise specified. Philips Semiconductors 811 East Arques Avenue P.O. Box 3409 Sunnyvale, California 94088-3409 Telephone 800-234-7381 (c) Copyright Philips Electronics North America Corporation 2001 All rights reserved. Printed in U.S.A. Date of release: 09-01 Document order number: 9397 750 08895
Philips Semiconductors
2001 Sep 24 57

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