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E2E0022-27-Y3 Semiconductor
Semiconductor MSM6577-xx
GENERAL DESCRIPTION
This version: Jan. 1998 MSM6577-xx Previous version: Mar. 1996
Operatable at 0.9V and Built-in LCD Driver 4-Bit Microcontroller
The MSM6577 is a 4-bit microcontroller that is fabricated in OKI's low-voltage CMOS technology, enabling operation at 0.9 V. This device incorporates LCD drivers, 8-bit synchronous serial ports, and a buzzer output circuit. The MSM6577 is optimized for remote-control microcontroller applications that are portable and battery powered.
FEATURES
* Operating range Operating frequency Operating voltage : 32.768 kHz : MSM6577K/N/S/U : MSM6577L/C/D/E (See Mask Option List.) : -20 to +70C : 1536 words 17 bits : 128 words 4 bits : 61 ms
1.5 V operation 3.0 V operation
ROM RAM * Minimum instruction execution time * I/O port Input-output port : 1 port 4 bits Input only port : 1 port 4 bits Output only port : 1 port 4 bits * Serial port : 8-bit clock synchronous type * LCD drivers : 28 Duty and frame frequency are selectable by the mask options. 1/3 duty, 1/3 bias : Up to 75 segments 1/2 duty, 1/3 bias : Up to 52 segments * Halt release timers :4 Timer frequency is selectable by the mask options. * External interrupt :4 * Buzzer output :1 * Clock : 32.768 kHz crystal oscillator Oscillation starts at 0.9 V. * Power supply voltage : 1.5 V/3.0 V (selectable by mask option) (See Mask Option List) * Packageoptions: 56-pin plastic QFP (QFP56-P-910-0.65-K) (Product name : MSM6577 -GS-K) 56-pin plastic QFP (QFP56-P-910-0.65-2K) (Product name : MSM6577 -GS-2K) Chip indicates the code number. indicates the option code.
Operating temperature * Memory space
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Semiconductor
BLOCK DIAGRAM
ACC RAM 1284 bits FLAG PAGE WORK ADRS S-Bus ALU
A-Bus
MPX
D-Bus P2.3 P2.2 P2.1 P2.0 P1.3 P1.2 P1.1 P1.0 P0.3 P0.2 P0.1 P0.0 PORT2 PORT1 PORT0 PCIO0 XT OSC XTB SYSTEM CLOCK GENERATOR HRQSER EHRSER SERIAL HALT RELEASE SCND0 SCND1
SBFFH SBFFL
IRQEX EIEX
PNEX
SERIAL I/O
INTERRUPT CONTROL
MDTH
MDTL BD
BUZZER FRMT
PROGRAM ROM HRQTMR EHRTMR 153617 bits HALT RELEASE TIMER
TEMPO
PROGRAM COUNTER
ADDER TMOUT TIME BASE COUNTER INSTRUCTION DECODER STACK VCP VCM INSTRUCTION REG.
LCDCT
SEG0 LCD DRIVER
MSM6577-xx
VOLTAGE REGULATOR
SEG27 VDD VSS1 VSS2 VSS3 VEE
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MSM6577-xx
PIN CONFIGURATION (TOP VIEW)
RESET P2.3 P2.2 P2.1 P2.0/SOUT P1.3/SIN P1.2/SCLK VDD* P1.1 P1.0 P0.3 P0.2 P0.1 P0.0 SEG0 SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 SEG8 SEG9 SEG10 SEG11 SEG12 SEG13 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29
SEG27 SEG26 SEG25 SEG24 SEG23 SEG22 SEG21 SEG20 SEG19 SEG18 SEG17 SEG16 SEG15 SEG14
*
Pin 49 (VDD) is provided only when a 56-pin flat package is used.
TEST (NC) BD VSS1 XTB XT VDD VSS2 VSS3 VCM VCP VEE (NC) (NC)
NC: No-connection pin 56-Pin Plastic QFP
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MSM6577-xx
PIN DESCRIPTIONS
Symbol
PORT0 (P0.0 to P0.3)
Type I/O * 4-bit input-output port
Description
Circuit
* Input or output software selectable. * A pull-up resistor or pull-down resistor can be selected for each bit (P0.0 to P0.3) (via mask option). * When using port as output, the pull-up or pull-down resistor is disconnected from the pin. A
PORT1 (P1.0 to P1.3)
I
* 4-bit input port * Pull-up resistor or pull-down resistor can be selected for PORT1 (P1.0 to P1.3) (via mask option).
P1.0 P1.1 P1.2 P1.3 P2.0
External Interrupt ports
-- Serial clock pin Serial input pin Serial output pin -- SCLK SIN SOUT
B C B D E E F
PORT2 (P2.0 to P2.3)
O O I
* 4-bit output port Buzzer output pin * Reset input pin
P2.1 to P2.3
BD RESET
* System reset generation level "H" or "L" selectable (mask option) Note : If "H" is selected, pull-down resistor is used and if "L" is selected, pull-up resistor is used. TEST XT XTB VDD VSS1 VSS2 VSS3 VCP VCM VEE SEG0 to SEG27 I I O -- -- -- -- -- -- O 0V power supply pin -1.5 V power supply pin (power supply pin for -1.5 V operation) -3.0 V power supply pin (power supply pin for -3.0 V operation) -4.5 V power supply pin Capacitor connection pin for voltage converter Internal logic power supply pin (voltage regulator output pin) Liquid crystal display driving pins Test pin (Tie to the negative pole of the battery.)* Oscillation crystal connection pin
G H -- -- -- -- -- -- I
*
3.0 V operation ...... VSS = VSS2 1.5 V operation ...... VSS = VSS1
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Semiconductor
MSM6577-xx
Pin Circuits
A. Input-output port
VDD VSS: by power supply specification Pull-up control signal CMOS inverter (Internal logic) VSS 3-state CMOS buffer VDD I VSS I/O switching signal O 3.0 V operation ... VSS=VSS2 1.5 V operation ... VSS=VSS1 I VSS O
(Internal logic) VSS
Pull-down control signal
VSS
B. Input port
VDD
Pull-up control signal CMOS inverter (Internal logic) VSS
Pull-down control signal
VSS
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Semiconductor C. Input port
VDD
MSM6577-xx
Pull-up control signal CMOS inverter (Internal logic) VSS 3-state CMOS buffer SCLK VSS Serial output control signal
Pull-down control signal
VSS
D. Output port
CMOS inverter (Internal logic) (SOUT) VSS Output switching control signal
E. Output port, BD pin
CMOS inverter (Internal logic) VSS
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Semiconductor F. RESET pin
VDD
MSM6577-xx
2
CMOS Schmitt trigger buffer
1 VSS 1 2
(Internal Logic)
"1"...System reset generated by a "H" level VSS "2"...System reset generated by a "L" level
G. TEST pin
CMOS inverter (Internal logic) VSS
VSS
H. Oscillation part (XT, XTB pins)
VDD CG ROM Option (normally connected) CMOS Inverter (Internal logic) Rf VEE VEE Constants CD VEE Rf=approximately 20 MW CD=approximately 20 pF CG=approximately 5 pF
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Semiconductor I. LCD driver
VDD / VSS1
MSM6577-xx
(Internal logic)
VSS2 / VSS3
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Semiconductor
MSM6577-xx
ABSOLUTE MAXIMUM RATINGS (MSM6577K/77N/77S/77U)
1.5 V operation *Backup flag (BUF)="0" The input of the constant voltage circuit corresponds to the output of the voltage converter VDD=0 V (VSS1=Battery Voltage) (VSS2).
Parameter Power Supply Voltage 1 Power Supply Voltage 2 Power Supply Voltage 3 Input Voltage Output Voltage 1 *1,*2 Output Voltage 2 *2 Output Voltage 3 *2 Storage Temperature Symbol VSS1 VSS2 VSS3 VIN VO1 VO2 VO3 TSTG -- Ta=25C Condition Rating -4.0 to +0.3 -7.0 to +0.3 -7.0 to +0.3 VSS1-0.3 to +0.3 VSS1-0.3 to +0.3 VSS2-0.3 to +0.3 VSS3-0.3 to +0.3 -55 to +125 C V Unit
*1 Normal output *2 LCD driver output
RECOMMENDED OPERATING CONDITIONS (MSM6577K/77N/77S/77U)
1.5 V operation *Backup flag (BUF)="0" The input of the constant voltage circuit corresponds to the output of the voltage converter (VSS2). VDD=0 V (VSS1=Battery Voltage)
Parameter Operating Voltage Operating Temperature Oscillation Frequency Symbol Vop Top fOSC Condition -- -- -- Range -0.9 to -1.75 -20 to +70 32.768 Unit V C kHz
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MSM6577-xx
ELECTRICAL CHARACTERISTICS (MSM6577K/77N/77S/77U)
1.5 V operation *Backup flag (BUF)="0" The input of the constant voltage circuit corresponds to the output of the voltage converter (VSS2). (VDD=0 V, VSS1=-1.5 V (Battery Voltage), VSS2=-3.0 V, VSS3=-4.5 V, fOSC=32.768 kHz, CX=35 pF, Ta=25C)
Parameter Current Consumption Oscillation Start Voltage Output Current 1 Output Current 2 Output Current 3 (LCD driver Common * Segment) Symbol IDD -VOSC -IOH1 IOL1 -IOH2 IOL2 -IOH3 IOMH3 IOML3 IOL3 Input Current 1 IIH1 Condition *1 Within 2 sec VO=-0.5 V VO=-1.0 V VO=-0.5 V VO=-1.0 V VOH=-0.2 V VOMH=VSS1 0.2 V VOML=VSS2 0.2 V VOL=-4.3 V VI=0 V, Input mode, with pull-down resistor VI=-1.5 V, Input mode, with pull-up resistor VI=0 V, -1.5 V Input mode, without internal resistor VI=0 V, with pull-down resistor VI=-1.5 V, with pull-up resistor -- Min. Typ. Max. Unit -- A 3 -- -- -- 0.9 V 150 -- -- A 150 20 20 4 4 4 4 3.75 -- -- -- -- -- -- -- 7.5 -- -- -- -- -- -- -- 15 A PORT0, PORT1 *2 A SEG0 to SEG27 A Applicable Pin -- VSS1 PORT0, PORT 2 *2 SOUT, SCLK BD
Input Current 2
-|IL2
3.75
7.5
15
A
PORT0, PORT1 *2
Input Leakage Current
|IIL|
--
--
1
A
PORT0, PORT1 *2 SIN, SOUT, SCLK RESET *3 RESET *3 TEST RESET *3
Input Current 3
IIH3
30
100
200
A
Input Current 4
-IIL4
30
100
200
A
Input Voltage
-VIH -VIL
-- 1.2
-- --
0.3 --
V
All input pins
*1 Dependent on program ("3 mA typ." is under 5% duty of the microcontroller). *2 PORT0=P0.0 to P0.3, PORT1=P1.0 to P1.3, PORT2=P2.0 to P2.3 (P1.2 is shared with SCLK, P1.3 with SOUT, and P2.0 with SIN) *3 The RESET pin can be selected by mask option (with pull-down, with pull-up or without internal resistor). MSM6577K: System reset by a "H" level with a pull-down resistor MSM6577N: System reset by a "H" level without a pull-down resistor MSM6577S: System reset by a "L" level with a pull-up resistor MSM6577U: System reset by a "L" level without a pull-up resistor
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Semiconductor
MSM6577-xx
ABSOLUTE MAXIMUM RATINGS (MSM6577K/N/S/U)
1.5 V operation *Backup flag (BUF)="1" The input of the constant voltage circuit corresponds to the output of the battery (VSS1).
VDD=0 V (VSS1=Battery Voltage) Parameter Power Supply Voltage 1 Power Supply Voltage 2 Power Supply Voltage 3 Input Voltage Output Voltage 1 *1,*2 Output Voltage 2 *2 Output Voltage 3 *2 Storage Temperature Symbol VSS1 VSS2 VSS3 VIN VO1 VO2 VO3 TSTG -- Ta=25C Condition Rating -4.0 to +0.3 -7.0 to +0.3 -7.0 to +0.3 VSS1-0.3 to +0.3 VSS1-0.3 to +0.3 VSS2-0.3 to +0.3 VSS3-0.3 to +0.3 -55 to +125 C V Unit
*1 Normal output *2 LCD driver output
RECOMMENDED OPERATING CONDITIONS (MSM6577K/N/S/U)
1.5 V operation *Backup flag (BUF)="1" The input of the constant voltage circuit corresponds to the output of the battery (VSS1).
VDD=0 V (VSS1=Battery Voltage) Parameter Operating Voltage Operating Temperature Oscillation Frequency Symbol Vop Top fOSC Condition -- -- -- Range -0.9 to -1.75 -20 to +70 32.768 Unit V C kHz
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Semiconductor
MSM6577-xx
ELECTRICAL CHARACTERISTICS (MSM6577K/N/S/U)
1.5 V operation *Backup flag (BUF)="1" The input of the constant voltage circuit corresponds to the output of the battery (VSS1).
(VDD=0 V, VSS1=-1.5 V (Battery Voltage), VSS2=-3.0 V, VSS3=-4.5 V, fOSC=32.768 kHz, CX=35 pF, Ta=25C) Parameter Current Consumption Oscillation Start Voltage Output Current 1 Output Current 2 Output Current 3 (LCD driver Common * Segment) Symbol IDD -VOSC -IOH1 IOL1 -IOH2 IOL2 -IOH3 IOMH3 IOML3 IOL3 Input Current 1 IIH1 Condition *1 Within 2 sec VO=-0.5 V VO=-1.0 V VO=-0.5 V VO=-1.0 V VOH=-0.2 V VOMH=VSS1 0.2 V VOML=VSS2 0.2 V VOL=-4.3 V VI=0 V, Input mode, with pull-down resistor VI=-1.5 V, Input mode, with pull-up resistor VI=0 V, -1.5 V Input mode, without internal resistor VI=0 V, with pull-down resistor VI=-1.5 V, with pull-up resistor -- 4 3.75 -- 7.5 -- 15 A PORT0, PORT1 *2 4 -- -- Min. Typ. Max. Unit -- -- 150 150 20 20 4 4 1.5 -- -- -- -- -- -- -- -- 0.9 -- -- -- -- -- -- A SEG0 to SEG27 A A V A Applicable Pin -- VSS1 PORT0, PORT2 *2 SOUT, SCLK BD
Input Current 2
-|IL2
3.75
7.5
15
A
PORT0, PORT1 *2
Input Leakage Current
IIL
--
--
1
A
PORT0, PORT1 *2 SIN, SOUT, SCLK RESET *3 RESET *3 TEST RESET *3
Input Current 3
IIH3
30
100
200
A
Input Current 4
-IIL4
30
100
200
A
Input Voltage
-VIH -VIL
-- 1.2
-- --
0.3 --
V
All input pins
*1 Dependent on program ("1.5 mA typ." is under 5% duty of the microcontroller) *2 PORT0=P0.0 to P0.3, PORT1=P1.0 to P1.3, PORT2=P2.0 to P2.3 (P1.2 is shared with SCLK, P1.3 with SOUT, and P2.0 with SIN.) *3 RESET pin can be selected by mask option (with pull-down, with pull-up or without internal resistor). MSM6577K: System reset by a "H" level with a pull-down resistor MSM6577N: System reset by a "H" level without a pull-down resistor MSM6577S: System reset by a "L" level with a pull-up resistor MSM6577U: System reset by a "L" level without a pull-up resistor
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Semiconductor
MSM6577-xx
ABSOLUTE MAXIMUM RATINGS (MSM6577L/C/D/E)
3.0 V operation *Backup flag (BUF)="0" The input of the constant voltage circuit corresponds to the output of the voltage converter VDD=0 V (VSS2=Battery Voltage) (VSS1).
Parameter Power Supply Voltage 1 Power Supply Voltage 2 Power Supply Voltage 3 Input Voltage Output Voltage 1 *2 Output Voltage 2 *1,*2 Output Voltage 3 *2 Storage Temperature Symbol VSS1 VSS2 VSS3 VIN VO1 VO2 VO3 TSTG -- Ta=25C Condition Rating -4.0 to +0.3 -7.0 to +0.3 -7.0 to +0.3 VSS2-0.3 to +0.3 VSS1-0.3 to +0.3 VSS2-0.3 to +0.3 VSS3-0.3 to +0.3 -55 to +125 C V Unit
*1 Normal output *2 LCD driver output
RECOMMENDED OPERATING CONDITIONS (MSM6577L/C/D/E)
3.0 V operation *Backup flag (BUF)="0" The input of the constant voltage circuit corresponds to the output of the voltage converter VDD=0 V (VSS2=Battery Voltage) (VSS1).
Parameter Operating Voltage Operating Temperature Oscillation Frequency Symbol Vop Top fOSC Condition -- -- -- Range -1.8 to -3.5 -20 to +70 32.768 Unit V C kHz
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Semiconductor
MSM6577-xx
ELECTRICAL CHARACTERISTICS (MSM6577L/C/D/E)
3.0 V operation *Backup flag (BUF)="0" The input of the constant voltage circuit corresponds to the output of the voltage converter (VSS1). (VDD=0 V, VSS1=-1.5 V, VSS2=-3.0 V (Battery Voltage), VSS3=-4.5 V, fOSC=32.768 kHz, CX=35 pF, Ta=25C)
Parameter Current Consumption Oscillation Start Voltage Output Current 1 Output Current 2 Output Current 3 (LCD driver Common/Segment) Symbol IDD -VOSC -IOH1 IOL1 -IOH2 IOL2 -IOH3 IOMH3 IOML3 IOL3 Input Current 1 IIH1 Conditions *1 Within 2 sec VO=-0.5 V VO=-2.5 V VO=-0.5 V VO=-2.5 V VOH=-0.2 V VOMH=VSS1 0.2 V VOML=VSS2 0.2 V VOL=-4.3 V VI=0 V, Input mode, with pull-down resistor VI=-3.0 V, Input mode, with pull-up resistor VI=0 V, -3.0 V Input mode, without internal resistor VI=0 V, with pull-down resistor VI=-3.0 V, with pull-up resistor -- Min. Typ. Max. Unit -- 0.75 -- A -- -- 1.8 V 500 -- -- A 500 20 20 4 4 4 4 60 -- -- -- -- -- -- -- 120 -- -- -- -- -- -- -- 240 A PORT0, PORT1 *2 A SEG0 to SEG27 A Applicable Pin -- VSS2 PORT0, PORT2 *2 SOUT, SCLK BD
Input Current 2
-|IL2
60
120
240
A
PORT0, PORT1 *2
Input Leakage Current
IIL
--
--
1
A
PORT0, PORT1 *2 SIN, SOUT, SCLK RESET *3 RESET *3 TEST RESET *3
Input Current 3
IIH3
200
750
1500
A
Input Current 4
-IIL4
200
750
1500
A
Input Voltage
-VIH -VIL
-- 2.5
-- --
0.5 --
V
All input pins
*1 Dependent on program ("0.75 mA typ." is under 5% duty of the MCU.) *2 PORT0=P0.0 to P0.3, PORT1=P1.0 to P1.3, PORT2=P2.0 to P2.3 (P1.2 is shared with SCLK, P1.3 with SOUT, and P2.0 with SIN.) *3 RESET pin can be selected by mask option (with pull-down, with pull-up or without internal resistor). MSM6577L: System reset by a "H" level with a pull-down resistor MSM6577C: System reset by a "H" level without a pull-down resistor MSM6577D: System reset by a "L" level with a pull-up resistor MSM6577E: System reset by a "L" level without a pull-up resistor
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Semiconductor
MSM6577-xx
ABSOLUTE MAXIMUM RATINGS (MSM6577L/C/D/E)
3.0 V operation *Backup flag (BUF)="1" The input of the constant voltage circuit corresponds to the output of the battery (VSS2).
VDD=0 V (VSS2=Battery Voltage) Parameter Supply Voltage 1 Supply Voltage 2 Supply Voltage 3 Input Voltage Output Voltage 1 *2 Output Voltage 2 *1,*2 Output Voltage 3 *2 Storage Temperature Symbol VSS1 VSS2 VSS3 VIN V01 V02 V03 TSTG -- Ta=25C Condition Rating -4.0 to +0.3 -7.0 to +0.3 -7.0 to +0.3 VSS2-0.3 to +0.3 VSS1-0.3 to +0.3 VSS2-0.3 to +0.3 VSS3-0.3 to +0.3 -55 to +125 C V Unit
*1 Normal output *2 LCD driver output
RECOMMENDED OPERATING CONDITIONS (MSM6577L/C/D/E)
3.0 V operation *Backup flag (BUF)="1" The input of the constant voltage circuit corresponds to the output of the battery (VSS2).
VDD=0 V (VSS2=Battery Voltage) Parameter Operating Voltage Operating Temperature Oscillation Frequency Symbol Vop Top fOSC Condition -- -- -- Range -0.9 to -3.5 -20 to +70 32.768 Unit V C kHz
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Semiconductor
MSM6577-xx
ELECTRICAL CHARACTERISTICS (MSM6577L/C/D/E)
3.0 V operation *Backup flag (BUF)="1" The input of the constant voltage circuit corresponds to the output of the battery (VSS2).
(VDD=0 V, VSS1=-1.5 V, VSS2=-3.0 V (Battery Voltage), VSS3=-4.5 V, fOSC=32.768 kHz, CX=35 pF, Ta=25C) Parameter Current Consumption Oscillation Start Voltage Output Current 1 Output Current 2 Output Current 3 (LCD driver Common * Segment) Symbol IDD -VOSC -IOH1 IOL1 -IOH2 IOL2 -IOH3 IOMH3 IOML3 IOL3 Input Current 1 IIH1 Condition *1 Within 2 sec VO=-0.5 V VO=-2.5 V VO=-0.5 V VO=-2.5 V VOH=-0.2 V VOMH=VSS1 0.2 V VOML=VSS2 0.2 V VOL=-4.3 V VI=0 V, Input mode, with pull-down resistor VI=-3.0 V, Input mode, with pull-up resistor VI=0 V, -3.0 V Input mode, without internal resistor VI=0 V, with pull-down resistor VI=-3.0 V, with pull-up resistor -- Min. Typ. Max. Unit -- -- 500 500 20 20 4 4 4 4 60 1.5 -- -- -- -- -- -- -- -- -- 120 -- 0.9 -- -- -- -- -- -- -- -- 240 A PORT0, PORT1 *2 A SEG0 to SEG27 A A V A Applicable Pin -- VSS2 PORT0, PORT2 *2 SOUT, SCLK BD
Input Current 2
-|IL2
60
120
240
A
PORT0, PORT1 *2
Input Leakage Current
|IL
--
--
1
A
PORT0, PORT1 *2 SIN, SOUT, SCLK RESET *3 RESET *3 TEST RESET *3
Input Current 3
IIH3
200
750
1500
A
Input Current 4
-IIL4
200
750
1500
A
Input Voltage
-VIH -VIL
-- 2.5
-- --
0.5 --
V
All input pins
*1 Dependent on program ("1.5 mA typ." is under 5% duty of the MCU.) *2 PORT0=P0.0 to P0.3, PORT1=P1.0 to P1.3, PORT2=P2.0 to P2.3 (P1.2 is shared with SCLK, P1.3 with SOUT, and P2.0 with SIN.) *3 RESET pin can be selected by mask option (with pull-down, with pull-up or without internal resistor). MSM6577L: System reset by a "H" level with a pull-down resistor MSM6577C: System reset by a "H" level without a pull-down resistor MSM6577D: System reset by a "L" level with a pull-up resistor MSM6577E: System reset by a "L" level without a pull-up resistor
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Semiconductor
MSM6577-xx
MASK OPTION LIST
The device names for the MSM6577-xx are differentiated as follows, depending on the combination of a power supply voltage and RESET pin function.
No. 1 2 3 4 5 6 7 8 Battery 1.5 V operation 1.5 V operation 1.5 V operation 1.5 V operation 3.0 V operation 3.0 V operation 3.0 V operation 3.0 V operation RESET Pin Function System reset by a "H" level with a pull-down resistor System reset by a "H" level without a pull-down resistor System reset by a "L" level with a pull-up resistor System reset by a "L" level without a pull-up resistor System reset by a "H" level with a pull-down resistor System reset by a "H" level without a pull-down resistor System reset by a "L" level with a pull-up resistor System reset by a "L" level without a pull-up resistor Device MSM6577K-xx MSM6577N-xx MSM6577S-xx MSM6577U-xx MSM6577L-xx MSM6577C-xx MSM6577D-xx MSM6577E-xx
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Semiconductor
MSM6577-xx
NOTES ON USE
Power Supply for 0.9 V Microcontroller Series: Backup Flag and Constant-Voltage Circuit The 0.9 V microcontroller series have a built-in constant-voltage circuit. The output of this constant-voltage circuit powers the microcontroller's internal logic circuits. Setting a backup flag (BUF) allows the input of the constant voltage circuit to be switched to either the battery or the output generated in the voltage converter, based on the battery voltage. A battery voltage of 1.5 V or 3.0 V can be selected.
VDD (0 V) VSS1 (-1.5 V) VSS2 (-3.0 V) * VSS3 (-4.5 V)
Voltage converter
Backup flag (BUF)
Internal logic
XT XTAL XTB
Constant voltage circuit VR
VEE (About-1.3 V) LCD driver* * The VSS3 pin is provided for the devices that contain an LCD driver.
The output (VEE) of the constant-voltage circuit is set at approximately -1.3 V. This allows the current consumed by the internal logic to be limited, irrespective of the battery voltage. However, if the input of the constant voltage circuit is below this set value (about -1.3 V), the output (VEE) is equal to the input. The 0.9 V microcontroller can be operated even if the internal voltage (output from the constant-voltage circuit) falls to 0.9 V. Setting the backup flag allows a larger operating voltage margin despite changes in internal voltage due to noise. For example, for the 1.5 V operation, setting the backup flag to "0" supplies twice the battery voltage to the constant-voltage circuit. Thus, even if the battery voltage falls to 0.9 V, the output voltage (VEE) is maintained at -1.3 V, providing a larger margin of operating voltage of the internal logic circuits because 1.8 V is applied to the input of the constant-voltage circuit. Figures 1 to 4 show the internal status depending on the backup flag settings for the battery, as well as status features.
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Semiconductor (Figure 1) 1.5 V Operation (Backup Flag="1")
VDD=0 V VB=-1.5 V VDD
Voltage converter Internal logic Internal status Operating range
Current consumption
MSM6577-xx
The battery level VSS1 is applied to the input of the constant voltage circuit. -0.9 to -1.75 V 1.5 mA*
VSS1 VSS2 (-3.0 V) VR VEE
Voltage doubler
Feature
When the battery level is powered down, the internal circuit is powered directly by the battery.
* When the software duty is about 5%
(Figure 2) 1.5 V Operation (Backup Flag="0")
Internal status Internal logic Operating range
Current consumption
VDD=0 V VB=-1.5 V VDD
Voltage converter
A doubled level of VSS2 is applied to the input of the constant voltage circuit. -0.9 to -1.75 V 3 mA* When the baftery level is powered down, a larger operating voltage margin is gained, compared to the case of Figure 1.
VSS1 VSS2 (-3.0 V) VR VEE
Voltage doubler
Feature
* When the software duty is about 5%
(Figure 3) 3.0 V Operation (Backup Flag="1")
VDD=0 V VDD (-1.5 V) VB=-3.0 V VSS2
Voltage converter
Internal status Internal logic Operating range
Current consumption
The battery level VSS2 is applied to the input of the constant voltage circuit. -0.9 to -3.5 V 1.5 mA*
VSS1
Voltage doubler
VR VEE
Feature
When the battery level is powered down, the internal circuit is powered directly by the battery.
* When the software duty is about 5%
19/22
Semiconductor (Figure 4) 3.0 V Operation (Backup Flag="0")
Internal status Internal logic Operating range
Current consumption
MSM6577-xx
VDD=0 V VDD (-1.5 V) VB=-3.0 V VSS2
Voltage converter
A doubled level of VSS1 is applied to the input of the constant voltage circuit. -1.8 to -3.5 V 0.75 mA* When the battery level is powered down, a smaller operating voltage margin is gained, compared to the case of Figure 3.
VSS1
Voltage rise
VR VEE
Feature
* When the software duty is about 5%
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Semiconductor
MSM6577-xx
PACKAGE DIMENSIONS
(Unit : mm)
QFP56-P-910-0.65-K
Mirror finish
Package material Lead frame material Pin treatment Solder plate thickness Package weight (g)
Epoxy resin 42 alloy Solder plating 5 mm or more 0.36 TYP.
Notes for Mounting the Surface Mount Type Package The SOP, QFP, TSOP, SOJ, QFJ (PLCC), SHP and BGA are surface mount type packages, which are very susceptible to heat in reflow mounting and humidity absorbed in storage. Therefore, before you perform reflow mounting, contact Oki's responsible sales person for the product name, package name, pin number, package code and desired mounting conditions (reflow method, temperature and times).
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Semiconductor
MSM6577-xx
(Unit : mm)
QFP56-P-910-0.65-2K
Mirror finish
Package material Lead frame material Pin treatment Solder plate thickness Package weight (g)
Epoxy resin 42 alloy Solder plating 5 mm or more 0.43 TYP.
Notes for Mounting the Surface Mount Type Package The SOP, QFP, TSOP, SOJ, QFJ (PLCC), SHP and BGA are surface mount type packages, which are very susceptible to heat in reflow mounting and humidity absorbed in storage. Therefore, before you perform reflow mounting, contact Oki's responsible sales person for the product name, package name, pin number, package code and desired mounting conditions (reflow method, temperature and times).
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