Casio DL-270B, Руководство по обслуживанию

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— 3 —
3. CPU (MN158418YCY) PIN FUNCTION
Pin No.
1~7, 64
8~12
13
14
15
16
17
18~30
31, 32
33~39
40
41~43
44~56
57
58
59, 60
61
62
63
I/O
Out
In
In
In
In
Out
Out
Out
Out
Out
Out
In
Out
—
—
I/O
—
—
In
Signal
P00~P13
P20~P22, P32, P33
IRQ
DEBIN
IRQCNT
P40
P41
P42, P43, P50~P53
P70~P73, P80~P82
P83, P90
P91~P93
PA0~PA3
P60
P61~P63
PB0~PB3
PC1~PC3
PD0~PD3
PE0
VPP
VDD
OCS1, OCS2
VSS
SYNC
RST
Function
Common signal for keyboard
Key signal from keyboard
Timing pulse signal from printer
Not used
VDD (33 V, 30 mA)
Motor control signal
Ribbon shift signal for printer
Character selective signal for printer
Character selective signal for printer,
Segment signal for display
Segment signal for display,
Common signal for slide switch
VDD (33 V, 30 mA)
Signal from slide switch
Digit signal for display
GND terminal
VDD terminal
Clock signal for CPU
VSS terminal
Not used
Signal from slide switch, Reset signal