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T81L0003B
8-bit MCU
1. Features
Compatible with MCS-51 Embedded 8K Bytes OTP ROM 256 x 8-bit Internal RAM 13 Programmable I/O Lines for 18-pin Package 2 16-bit Timer/Counter & 1 16-bit Timer 2 External Interrupt Input Programmable Serial UART Interface Low Power Idle & Power-down Modes Watch-dog Timer On-chip Crystal & RC Oscillator (Selected by Bonding Option) Internal Power-on Reset and External Reset Supported SOP18/DIP18 Package 3.3V Operating Voltage
2. General Description
The T81L0003B is 8-bit microcontroller designed and developed with low power and high speed CMOS technology. It contains a 8K bytes OTP ROM, a 256 x 8 RAM, 13 I/O lines, a watchdog timer, two 16-bit counter/timers, a seven source, two-priority level nested interrupt structure, a full duplex UART, and an on-chip oscillator and clock circuits. In addition, the T81L0003B has two selectable modes of power reduction-idle mode and power-down mode. 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.
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3. Block Diagram
RAM Addr. Register
RAM
OTP ROM
B Register
ACC
Stack Pointer Program Address Register
TMP2 W DT
TMP1
Buffer ALU PC Incrementer
Interrupt, Serial port, and Timer Block
PSW
Program Counter DPTR
RST
Timing & Control
Instruction Register
Port 3 Latch
Port 1 Latch
OSC
Port 3 Drivers
Port 1 Drivers
XTAL1 XTAL2
P3.0 -P3.4
P1.0 -P1.7
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4. Pin Configuration
RST/VPP (RXD) P3.0 (TXD) P3.1 XOUT XIN (INT0) P3.2 (INT1) P3.3 (T0) P3.4 GND
1 2 3 4 5 6 7 8 9
18 17 16 15 14 13 12 11 10
VCC P1.7 P1.6 P1.5 P1.4 P1.3 P1.2 P1.1 P1.0
DIP-18/SOP-18 For Crystal Oscillator T81L0003B-BK/ T81L0003B-BD
RST/VPP (RXD) P3.0 (TXD) P3.1 OSCR STOP (INT0) P3.2 (INT1) P3.3 (T0) P3.4 GND
1 2 3 4 5 6 7 8 9
18 17 16 15 14 13 12 11 10
VCC P1.7 P1.6 P1.5 P1.4 P1.3 P1.2 P1.1 P1.0
DIP-18/SOP-18 For RC Oscillator T81L0003B-AK/ T81L0003B-AD
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Number (20-Pin) 1 2 3 4(BK,BD) 4(AK,AD) 5(BK,BD) 5(AK,AD) 6 7 8 9 10 11 12 13 14 15 16 17 18
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5. Pin Description
Name RST/VPP P3.0/(RXD) P3.1/(TXD) XOUT OSCR XIN STOP P3.2/(INT0) P3.3/(INT1) P3.4/(T0) GND P1.0 P1.1 P1.2 P1.3 P1.4 P1.5 P1.6 P1.7 VCC Type I I/O I/O O I I O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O Description Reset signal input or programming supply voltage input. General-purpose I/O pin (Default) or Serial input port. General-purpose I/O pin (Default) or Serial output port. Crystal oscillator output terminal. RC oscillator external resister connect pin. Crystal oscillator input terminal. Stop RC oscillator network. General-purpose I/O pin (Default) or External interrupt source 0. General-purpose I/O pin (Default) or External interrupt source 1. General-purpose I/O pin (Default) or Timer 0 external input pin. Ground General-purpose I/O pin General-purpose I/O pin General-purpose I/O pin General-purpose I/O pin General-purpose I/O pin General-purpose I/O pin General-purpose I/O pin General-purpose I/O pin 3.3V power supply.
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6. Temperature Limit Ratings
Parameter Operating temperature Range Storage Temperature Range Rating -40 to +85 -55 to +125 Units C C
7. Electrical Characteristics D.C Characteristics
Conditions 25C No load, Vcc=3.3V No load Vout >=VVOH(MIN.) VIH Hi-Level input voltage Vout <=VVOL(MIN.) Vout >=VVOH(MIN.) VIL Low-Level input voltage Vout <=VVOL(MIN.) IOH=-7uA VCC=MIN. VOH Hi-Level Output voltage VI=VIH or IOH=-45uA VIL IOH=-70uA IOL=12mA VCC=MIN. VOL1 Low-Level Output voltage VI=VIH or IOL=25mA (P1.0 only) VIL IOL=40mA IOL=4mA VCC=MIN. VOL2 Low-Level Output voltage VI=VIH or IOL=12mA (Else Pins) VIL IOL=20mA Symbol VCC ICC IPD Parameter Operating Voltage Operating Current Power down mode current Min 3.0 2.1 2.9 2.4 1.9 Typ 3.3 5 1 Max 3.6 0.6 0.2 0.4 0.6 0.2 0.4 0.6 Units V mA uA V V V
-
V
V
A.C Characteristics
Symbol FSYS1 FSYS2 tRES Parameter System Clock 1 (Crystal OSC) System Clock 2 (RC OSC) External Reset High Pulse Width Power ON Start up Time Conditions VCC=3.3V VCC=3.3V Min Typ 12 12 10 20 Max 24 Units MHz MHz system cycle ms
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8. Function Description
8.1. Special Function Register
F8H F0H E8H E0H D8H D0H C8H C0H B8H B0H A8H 98H 90H 88H
B ACC PSW T2CON T2MOD IP P3 IE SCON P1 TCON
TL2
TH2
SBUF TMOD TL0 TL1 TH0 TH1
Accumulator : ACC
ACC is the Accumulator register. The mnemonics for Accumulator-Specific instructions, however, refer to the Accumulator simply as A.
B Register : B
The B register is used during multiply and divide operations. For other instructions it can be treated as another scratch pad register.
Program Status Word : PSW
The PSW register contains program status information as detailed in CY AC F0 RS1 RS0 OV -P
BIT SYMBOL FUNCTION PSW.7 CY Carry flag. PSW.6 AC Auxiliary Carry flag. (For BCD operations.) PSW.5 F0 Flag 0. (Available to the user for general purposes.) PSW.4 RS1 Register bank select control bit 1. Set/cleared by software to determine working register bank. (See Note.) PSW.3 RS0 Register bank select control bit 0. Set/cleared by software to determine working register bank. (See Note.) PSW.2 OV Overflow flag. PSW.1 -- User-definable flag. PSW.0 P Parity flag. Set/cleared by hardware each instruction cycle to indicate an odd/even number of "one" bits in the Accumulator, i.e., even parity. NOTE: The contents of (RS1, RS0) enable the working register banks as follows: (0,0)-- Bank 0 (00H-07H) (0,1)-- Bank 1 (08H-0fH) (1,0)-- Bank 2 (10H-17H) (1,1)-- Bank 3 (18H-17H)
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Stack Pointer : SP
The Stack Pointer register is 8 bits wide. It is incremented before data is stored during PUSH and CALL executions. While the stack may reside anywhere in on-chip RAM, the Stack Pointer is initialized to 07H after a reset. This causes the stack to begin at locations 08H.
Data Pointer (DPTR) : DPH & DPL
The Data Pointer (DPTR) consists of a high byte (DPH) and a low byte (DPL). Its intended function is to hold a 16-bit address. It may be manipulated as a 16-bit register or as two independent 8-bit registers.
Ports 1.0~1.7 & 3.0~3.4
All Ports are the SFR latches, respectively. Writing a one to a bit of a port SFR (P1 or P3) causes the corresponding port output pin to switch high. Writing a zero causes the port output pin to switch low. When used as an input, the external state of a port pin will be held in the port SFR (i.e., if the external state of a pin is low, the corresponding port SFR bit will contain a `0'; if it is high, the bit will contain a `1').
Serial Data Buffer : SBUF
The Serial Buffer is actually two separate registers, a transmit buffer and a receive buffer. When data is moved to SBUF, it goes to the transmit buffer and is held for serial transmission. (Moving a byte to SBUF is what initiates the transmission.) When data is moved from SBUF, it comes from the receive buffer.
Timer Registers : TH0, TL0, TH1, TL1,TH2,TL2
Register pairs (TH0, TL0) and (TH1, TL1) and (TH2, TL2) are 16-bit Counting registers for Timer/Counters 0 and Timer1and Timer2, respectively. .
Control Register : IP, IE, TMOD, TCON, SCON, PCON
Special Function Registers IP, IE, TMOD, TCON, SCON, and PCON contain control and status bits for the interrupt system, the Timer/Counters, and the serial port. They are described in later sections.
Standard Serial Interface
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. Mode 1: 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. Mode 2: 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. Mode 3: 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. 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'.
TM Technology Inc. reserves the right to change products or specifications without notice.
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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 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, in Mode 1 can be used to check the validity of the stop bit. In Mode 1 reception, if SM2 = `1', the receive interrupt will not active 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 11. 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) In the T81L0006A, 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) The Timer 1 interrupt should be disabled in this application. The Timer 1 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*(Oscillator Frequency)/ 32/12 / [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. MSB SM0 LSB RI
SM1
SM2
REN
TB8
RB8
TI
Where SM0, SM1 specify the serial port mode, as follows: SM0 SM1 Mode Description Baud Rate shift register f OSC / 12 0 0 0 8-bit UART Variable 0 1 1 9-bit UART UART FOSC /64 or FOSC /32 1 0 2 9-bit UART Variable 1 1 3
Interrupt Enable Register : IE
MSB EA
EA wdt ET2 ES ET1 EX1 ET0 EX0
wdt
ET2
ES
ET1
EX1
ET0
LSB EX0
IE.7 Disables all interrupts. If EA = 0, no interrupt will be acknowledged. If EA = 1, each interrupt source is individually enabled or disabled by setting or clearing its enable bit. IE.6 Watchdog timer refresh flag. IE.5 Enable or disable the Timer 2 overflow interrupt. IE.4 Enable or disable the serial port interrupt. IE.3 Enable or disable the Timer 1 overflow interrupt. IE.2 Enable or disable External Interrupt 1. IE.1 Enable or disable the Timer 0 overflow interrupt. IE.0 Enable or disable External Interrupt 0.
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8.2. External Register Table ( for LVR, High/ Normal Driving)
Register Address A15...A5-A0 Hex 100... 0010 1011 802bH 100... 0011 0000 8030H 100... 0011 0010 8032H Name PWMC2 LVR (Low Voltage Reset)* Port3 HDS Port3 I/O high driving set** Port1 HDS Port1 I/O high driving set** Comments
Note : * LVR (Low Voltage Reset) address : 802bH, read/write MSB Bit 7 Bit 6 Bit5 Bit 4 LVR[7] LVR[6]
Bit 3 Reserved
Bit 2
Bit1
LSB Bit 0
LVR[7] : if LVR[7] write `1', low voltage reset function enable. default is `0', low voltage reset function disable. LVR[6] : if LVR[6] write `1'= 2.1V reset. if LVR[6] write `0'= 2.8V reset. default is `0'= 2.8V reset. ** Port I/O high driving set if write `0' = set I/O to high driving current mode. if write `1' = set I/O to normal driving current mode. default is set `1'. Port 3 high driving address : 8030H MSB Bit 7 Bit 6 Bit5
Bit 4 Port3.4
Bit 3 Port3.3
Bit 2 Port3.2
Bit1 Port3.1
LSB Bit 0 Port3.0
Port 1 high driving address : 8032H MSB Bit 7 Bit 6 Bit5 Port1.7 Port1.6 Port1.5
Bit 4 Port1.4
Bit 3 Port1.3
Bit 2 Port1.2
Bit1 Port1.1
LSB Bit 0 Port1.0
8.3. I/O Ports
Port1
Port 1 is an 8-bit bi-directional I/O port with internal pull-ups. Port 1 output buffers can sink/source four external TTL device inputs. When port 1 pins are written as 1's, these pins are pulled high by the internal pull-ups and can be used as inputs. As inputs, Port 1 pins that are externally being pulled low will source current because of the internal pull-ups.
Port 3
Port 3 is an 8-bit bi-directional I/O port with internal pull-ups. Port 3 output buffers can sink/source four external TTL device inputs. When port 3 pins are written as 1's, these pins 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 internal pull-ups. Port 3 also serves the functions of various special features, as listed below: P3.0 RXD (serial input port) P3.1 TXD (serial output port) P3.2 INT0 (external interrupt 0) P3.3 INT1 (external interrupt 1) P3.4 T0 (timer 0 external input)
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8.4. Watchdog Timer
The watchdog timer is a 16-bit counter that is incremented once every 24 or 384 clock cycles. After an external reset the watchdog timer is disabled and all registers are set to zeros.
Watchdog Timer structure
The watchdog consists of 16-bit counter wdt, reload register wdtrel, prescalers by 2 and by 16 and control logic.
Watchdog block diagram
Start procedure
There are two ways to start the watchdog. One method, called hardware automatic start, is based on examining the level of signal swd during active internal rst signal. When this condition is met, the watchdog will start running automatically with default settings (all registers set to zeros).When this criterion is not met during active internal rst signal, a programmer can start the watchdog later. It will occur when signal swd becomes active. Once the watchdog is started it cannot be stopped unless internal rst signal becomes active. When wdt registers enters the state 7CFFh , asynchronous wdts signal will become active. The signal wdts sets the bit 6 in ip0 register and requests reset state. The wdts is cleared either by rst signal or change of the state of the wdt timer.
Refreshing the watchdog timer
The watchdog timer must be refreshed regularly to prevent reset request signal from becoming active. This requirement imposes obligation on the programmer to issue two followed instructions. The first instruction sets wdt and the second one swdt. The maximum allowed delay between settings of the wdt and swdt is 12 clock cycles. While this period has expired and swdt has not been set, wdt is automatically reset, otherwise the watchdog timer is reloaded with the content of the wdtrel register and wdt is automatically reset.
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T81L0003B
Special Function Registers
a) Interrupt Enable 0 register (ien0) The ien0 register (address : A8)
wdt
et2
es0
et1
ex1
et0
LSB ex0
The ien0 bit functions
Function Watchdog timer refresh flag. Set to initiate a refresh of the watchdog timer. Must be set directly before swdt is set to prevent ien0.6 wdt an unintentional refresh of the watchdog timer. The wdt is reset by hardware 12 instruction cycles after it has been set. Note: other bits are not used to watchdog control The ien0 bit functions b) Interrupt Enable 1 register (ien1) Bit Symbol
The ien1 register (Address : B8)
MSB swdt pt2 ps pt1 px1 pt0 LSB px0
The ien1 bit functions
Bit Ien1.6 Symbol swdt Function Watchdog timer start refresh flag. Set to active/refresh the watchdog timer. When directly set after setting wdt, a watchdog timer refresh is performed. Bit swdt is reset by hardware 12 instruction cycles after it has been set.
Pay attention that when write ien1.6, it write the swdt bit, when read ien1.6, we will read out the wdts bit. Ie. Watch dog timer status flag. Set by hardware when the watchdog timer was started. c) Watchdog Timer Reload register (wdtrel) The wdtrel register ( Address : 86 ) MSB 7 LSB 0
6
5
4
3
2
1
The wdtrel bit functions Bit Symbol
Function Prescaler select bit. When set, the watchdog is clocked through an additional wdtrel.7 7 divide-by-16 prescaler Seven bit reload value for the high-byte of the watchdog timer. This value is loaded wdtrel.6 t0 6-0 to the wdt when a refresh is triggered by a consecutive setting of bits wdt and swdt wdtrel.0 The wdtrel register can be loaded and read any time
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WDT Reset
Diagram
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A high on reset pin or watchdog reset request for two clock cycles while the oscillator is running resets the device.
Reset timing a) External hardware reset
Figure External reset timing **Note: clk: external clock input Tclk: clock period reset: external reset input rst: internally generated reset signal b) Watchdog timer reset
Figure Watchdog reset timing **Note: clk: external clock input Tclk: clock period wdt: watchdog timer registers wdts: watchdog timer status flag reset: external reset input rst: internally generated reset signal
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9. Timing Diagram
S1.........S 6 S1.........S 6 S1.........S 6 S1.........S 6 S1.........S 6 S1.........S 6 S1.........S 6 S1.........S 6 S1.........S 6 S1.........S 6
ALE
Write to SBUF
Send
Shift RXD
D0
D1
D2
D3
D4
D5
D6
D7
TXD
Write to SCON, Clear RI
RI
Receive
Shift
D0
RXD
D1
D2
D3
D4
D5
D6
D7
TXD
Serial Port Mode 0
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Receive
Transmit
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Write to SBUF
Shift TXD TI RX RXD Shift RI
Start Bit D0 D1 D2 D3 D4 D5 D6 D7 Stop Bit Start Bit D0 D1 D2 D3 D4 D5 D6 D7 Stop Bit
Serial Port Mode 1
TX
Write to SBUF
Send Data
Transmit
Stop Bit Start Bit D0 D1 D2 D3 D4 D5 D6 D7 TB8 Stop Bit
Shift TXD TI RX
Shift RI
Serial Port Mode 2 & 3
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Receive
RXD
Start Bit
D0
D1
D2
D3
D4
D5
D6
D7
TB8
Receive
Transmit
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Package Dimension
18-LEAD SOP
18
10
E
H
1
0.016typ
0.050typ
9
A
0.020X45 X L
D
0.004max
SYMBOLS A A1 D E H L X
MIN. 0.093 0.004 0.447 0.291 0.394 0.016 0
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A1
MAX. 0.104 0.012 0.463 0.229 0.419 0.050 8 UNIT: INCH
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E +0.020 B +0.020
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18-LEAD DIP
18
0.312 +- 0.012
0.290 +- 0.014
R40
10
1
9
C +- 14 A +- 10
D +- 14
0.310 M ax
0.115 Min.
0.100 Typ.
0.018 +0.012 Typ. 0.060 +0.015 Typ.
A 0.900
B 0.075
C 0.065
D 0.055
0.015 Min.
E 0.090 UNIT: INCH
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0.350 +- 0.020

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