Casio DR-220TA Panduan Servis - Halaman 5

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Casio DR-220TA Panduan Servis

3. CPU (MN158418YCY) PIN FUNCTION

Pin No.
P00~P13
1~7, 64
P20~P22, P32, P33
8~12
13
14
15
IRQCNT
16
17
P42, P43, P50~P53
18~30
P70~P73, P80~P82
P83, P90
31, 32
33~39
P91~P93
PA0~PA3
40
41~43
P61~P63
44~56
PB0~PB3
PC1~PC3
PD0~PD3
57
58
OCS1, OCS2
59, 60
61
62
63
Signal
I/O
Out
In
IRQ
In
DEBIN
In
In
P40
Out
P41
Out
Out
Out
Out
P60
Out
In
Out
PE0
VPP
—
VDD
—
I/O
VSS
—
SYNC
—
RST
In
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
— 3 —
Function