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6. LSI PIN FUNCTIONS
6-1. CPU: LSI1
No.1
Pin No.
Name
1 ~ 5
C0 ~ 4
6
GND
7,8
BZ1,2
9
VDD
10
CSRA1
11
CSRA2
12
CSROM
13
WEB
14,15
RA15,16
16 ~ 30
A0 ~ 14
31 ~ 38
IO0 ~ 7
39 ~ 54
KY0 ~ 15
55
SW
56
DEBUG
57
ON
58
CRCKI
59
SOUTB
60
SIN
61
VDD
62
TEST
63
VTM
I/O
Out
Common signal for display
In
GND 0 V
Out
Buzzer terminal
In
Power supply terminal (+5.3 V)
Out
Chip enable signal for LSI2
Out
Chip enable signal for LSI3
Out
Chip enable signal (Not used)
Out
Write enable signal for LSI2 and LSI3
Out
Address bus (Not used)
Out
Address bus
I/O
Data bus
I/O
Key signal
In
Battery switch
-
Not used
Out
Data communication enable signal
In
GND 0 V
Out
Transmission data output
In
Receiving data input
In
Power supply terminal (+5.3 V)
-
Not used
-
Not used
—
12
Description
Power on: 0 V off: 6 V
—
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