DS-685L/F Series Service Manual
Page No. 20
4.2.3. Microcomputer Pin Assignment
The uPD75P216A/uPD75212A Microcomputer was chosen for the following reasons:
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Low operating current.
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Having an on-chip programmable FIP controller/driver.
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Eight interrupt sources and efficient interrupt processing.
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Four versatile timers.
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Less chip count.
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Pin compatibility of similar package with difference ROM sizes.
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Good support.
Pin I/O Assignment Device Remark
P00/INT4 I ON/OFF ON/OFF KEY Detects ON/OFF Key Status
P01/SCK O SCK 93C46P EEPROM
P02/SO O S0 93C46P EEPROM
P03/SI I SI 93C46P EEPROM
P10/INT0 I A/D INT uPC4062 A/D Conversion Interrupt
P11/INT1 I VPAC L7815 Detects AC Power ON
P12/INT2 I * VBATL2 LM324 Detects BATT Low 2
P13/TI0 I TI0 74HC4520 External Event Pulse Input
P20 O CS 93C46P EEPROM
P21 O FIP-PW FIP-PW Controls FIP Power
P22 O RES 74HC4520 Controls 74HC4520 Reset
P23/BUZ O BUZZ Buzzer Buzzer Sounder
P30 I * VBATL1 LM324 Detects BATT Low 1
P31 I EN 74HC4520 Controls 74HC4520 EN
P32 O * BAT-CHG BAT-CHG Controls BATT Charge
P33 O * BAT-PW BAT-PW Controls BATT Power
P40 O A/D PA 74HC4066 Controls A/D Conversion
P41 O A/D PZ 74HC4066 Controls A/D Conversion
P42 O A/D P- 74HC4066 Controls A/D Conversion
P43 O A/D P+ 74HC4066 Controls A/D Conversion
P50 I Q0 74HC4520 Input data
P51 I Q1 74HC4520 Input data
P52 I * VBATLH2 LM324 Detects BATT High Level2
P53 I * VBATLH1 LM324 Detects BATT High Level1
P60 I K1 Keyboard Key Return Line
P61 I K2 Keyboard Key Return Line
P62 I K3 Keyboard Key Return Line
P63 I K4 Keyboard Key Return Line
S0 O P17 19-LT-03GK Segment Signal Output
S1 O P16 19-LT-03GK Segment Signal Output
S2 O P15 19-LT-03GK Segment Signal Output
S3 O P14 19-LT-03GK Segment Signal Output
S4 O P13 19-LT-03GK Segment Signal Output
S5 O P12 19-LT-03GK Segment Signal Output
S6 O P11 19-LT-03GK Segment Signal Output
S7 O P10 19-LT-03GK Segment Signal Output
S8 O P9 19-LT-03GK Segment Signal Output
S9 O P8 19-LT-03GK Segment Signal Output
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