Lsi, Ic (Pin Function); Cpu - Casio SF-4300B Service Manual & Parts List
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Also See for SF-4300B:
- Owner's manual (49 pages) ,
- Manual (8 pages) ,
- Owner's manual (48 pages)
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6.
LSI, IC (Pin function)
6-1. CPU
No.1
Pin No.
Signal
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/5.3[V]
Out
Chip enable signal (Not used)
Out
Chip enable signal for RAM
Out
Chip enable signal (Not used)
Out
Write enable signal for RAM
Out
Address bus (Not used)
Out
Address bus
I/O
Data bus
I/O
Key signal
In
Battery switch (On: "L"/0[V]
-
Test for manufacturer
Out
Data communication enable
In
GND/0[V]
Out
Transmission data output
In
Transmission data input
In
Power supply/5.3[V]
-
Test for manufacturer
-
Not used
—
—
12
Function
Off: "H"/6[V])
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