Pin Function - Casio CSF-5350 Service Manual & Parts List

PIN FUNCTION

CPU HCD62121A02 (HC-3017) : COB
NOTE: The CPU is bonding on the PCB. If the CPU is defective, replace the Z889-1 PCB ass'y
because the CPU cannot be replaced.
Pin No. Pin Name
1 ~ 14 KO14 ~ KO1
15 ~ 22 KI8 ~ KI1
23 BUFON
24 IT2
25 IT0
26 ~ 46 AO20 ~ AO0
47 ~ 54 IO0 ~ IO7
55 OEBO
56 WEBO
57 ~ 64 CS10BO ~ CS3BO
65 OPT7
69 ~ 72 OPT3 ~ OPT0
73 PORT7
74 PORT6
75 PORT5
76 PORT4
80 PORT0
81 VSS
82 PI
83 PO
84 VDD
85 XO
86 XI
87 VCC
88 VREG2
89, 90 TS1, TS2
91 VSSR
92 BZZ1
93 BZZ2
94 VSS
95 OCLK
96 ITOFF
97 TEMU
98 SW
99 VDB
100 VREG1
101 VREG4
102 VREG5
103 VDT1I
104 VDT2I
105 VREG3
Input/Output
O Key common signal
I Key input signal
O Chip select for RAM
I Interrupt input
I Interrupt input
O Address bus
I / O Data bus
O Output enable signal for RAM
O Write enable signal for RAM
O Chip selecting signals
O Reset signal output
O Changeover signal
I Receiving terminal for data communication
I Receiving terminal for data communication
O Transmitting terminal for data communication
O Transmitting terminal for data communication
I Low battery message for back-up battery (2.6V)
I GND
I 1MHz clock input
O 1MHz clock output
I +3V source
O 4.3MHz clock output
I 4.3MHz clock input
I +3V source
O Voltage for main switch detection
— Test terminals of factory purpose only
I GND
O Buzzer signal output
O Buzzer signal output
I GND
O Clock output
I Switching terminal from main switch
— Test terminals of factory purpose only
I Receiving terminal for reset switch
I +3V source
— Test terminals of factory purpose only
O +3V source for ROM
— Test terminals of factory purpose only
I Forced power off detecting terminal (2.3V)
I Low battery message for main battery (2.5V)
— +3V source for RAM
— 10 —
Function