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