Pin Function - Casio SF-4700L Service Manual & Parts List

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6. PIN FUNCTION

CPU µPD3058Ap-009 : COB (Chip on Board)
NOTE: The CPU is bonding on the PCB. If the CPU is defective, replace the PCB ASSY (A140745)
because the CPU cannot be replaced.
Pin No.
Pin Name
1
CSRA1
2
CSRA2
4
WEB
5 ~ 21
RA16,RA15,A14 ~ A0
22 ~ 29
IO7 ~ IO0
30 ~ 45
KY15 ~ KY0
46
SW
48
DN
50
SOUTB
51
SIN
52
VDD
53
TEST
54
VTM
55
OSC0
56
OSC1
57
GND
58 ~ 61
V4 ~ V1
62
INT0
63
STNT
64
VLCD
65 ~ 160
S95 ~ S0
161 ~ 193
C32 ~ C0
194
GND
195
BZ1
196
BZ2
197
VDD
Input/Output
O
Control for EL driver
O
Chip selecting signal for RAM
O
Write enable signal for RAM
O
Address bus
I / O
Data bus
I
Key input signal
I
Detection signal for battery cover
O
Serial data output
O
Control for serial data output
I
Serial data input
I
Power supply to digtal circuit
TEST terminal
O
Voltage for the intenal circuit of CPU
I
Clock for CPU
O
Clock for CPU
GND
O
Bias voltage to LCD
I
Control for forced power off
I
Control for VLCD
I
Power supply to LCD
O
LCD driver signal (common)
O
LCD driver signal (segment)
GND
O
Buzzer signal output
O
Buzzer signal output
I
Power suply to digital circuit
— 12 —
Function

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