— 2 —
Pin No. Signal I/O Function
1~7, 64 P00~P13 Out Common signal for keyboard
8~12 P20~P22, P32, P33 In Key signal from keyboard
13 IRQ In Timing pulse signal from printer
14 DEBIN In Reset pulse (Not used)
15 IRQCNT In Auxiliary timing (VDD)
16 P40 Out Motor control signal
17 P41 Out Ribbon shift signal for printer
18~30 P42, P43, P50~P53, Out Character selective signal for printer
P70~P73, P80~P82
31, 32 P83, P90 Out Segment signal for display,
Character selective signal for printer
33~39 P91~P93 Out Common signal for slide switch,
PA0~PA3 Segment signal for display
40 P60 In Input port (VDD)
41~43 P61~P63 In Signal from slide switch
44~56 PB0~PB3, Out Digit signal for display
PC0~PC3,
PD0~PD3,
PE0
57 VPP In GND terminal
58 VDD In VDD terminal (+33 V)
59, 60 OSC1, OSC2 I/O Clock signal for CPU
61 VSS In VSS terminal (+28 V)
62 SYNC — Not used
63 RST In Signal from slide switch, Reset signal
3. CPU (MN158418YCY) PIN FUNCTION
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