Digi DS-685L Series User Manual

DS-685L/F Series Service Manual
Page No. 17
4.1.3. Microcomputer Pin Assignment
The uPD75P308GF/uPD75308GF Microcomputer was chosen for the following reasons:
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Low operating current
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Having an on-chip programmable LCD controller/driver
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Six interrupt sources and efficient interrupt processing
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Three 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
P01/SCK O SCK 93C46P EEPROM
P02/SO O S0 93C46P EEPROM
P03/SI I SI 93C46P EEPROM
P10/INT0 I SPANSW SWITCH Span Enable/Disable
P11/INT1 I A/D INT uPC4062 A/D Conversion Interrupt
P12/INT2 I BATTERY DETECT 1 uPC393C Detects battery Voltage Level 1
P13/TI0 I BATTERY DETECT 2 uPC393C Detects battery Voltage Level 2
P20/PTO0 O A/D CONTROL 74HC4066 A/D Conversion Control
P21 O A/D CONTROL 74HC4066 A/D Conversion Control
P22/PCL O A/D CONTROL 74HC4066 A/D Conversion Control
P23/BUZ O A/D CONTROL 74HC4066 A/D Conversion Control
P30 O CS 93C46P EEPROM
P31 O MAIN POWER ON/OFF Power Switch DC MAIN POWER
P32 O BUZZ Buzzer Buzzer Sounder
P33
P40 O T8 Keyboard Key Scanning Line
P41 O T1 Keyboard Key Scanning Line
P42 O T2 Keyboard Key Scanning Line
P43 O T3 Keyboard Key Scanning Line
P50 O T4 Keyboard Key Scanning Line
P51 O T5 Keyboard Key Scanning Line
P52 O T6 Keyboard Key Scanning Line
P53 O T7 Keyboard Key Scanning Line
P60/KR0 I K1 Keyboard Key Return Line
P61/KR1 I K2 Keyboard Key Return Line
P62/KR2 I K3 Keyboard Key Return Line
P63/KR3 I K4 Keyboard Key Return Line
P70/KR4 I K5 Keyboard Key Return Line
P71/KR5
P72/KR6
P73/KR7
S0 O SEGMENT 0 T195013 Segment Signal Output
S1 O SEGMENT 1 T195013 Segment Signal Output
S2 O SEGMENT 2 T195013 Segment Signal Output
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Digi DS-685L Series Specifications

General

Brand	Digi
Model	DS-685L Series
Category	Scales
Language	English