— 26 —
Pin No.
Name
I / O
Function
1
VDD
I
Power supply for this CPU
2~65
S1~48,C1~16
O
Common signals to LCD
66
V1
O
67
V2
O
68
V3
O
Bias power supply to LCD
69
V4
O
70
V5
O
71
VLCD
O
Power supply to LCD
78
VSS
— Ground for this CPU
80
P41
O
Clock for LCD driver LSI(U2, U3:LC868900)
82
P43
O
Signal to LCD driver LSI(U2, U3:LC868900)(AC voltage is supplied to LCD by this
signal.)
84
P46
O
Read signal to RAM(U42, U62) and LCD driver LSI(U2, U3:LC868900)
85
P47
O
Write signal to RAM(U42, U62) and LCD driver LSI(U2, U3:LC868900)
87
P71
I
Detection of low battery voltage(=2.5V) from IC(U2:S80725)
90
P10
O
Serial data output to another unit or a personal computer
91
P11
I
Serial data input from another unit or a personal computer
93
P13
O
Control signal to power supply IC(DC/AC inverter IC) for EL (H: EL-OFF/L: EL-ON)
96
P16
O
Control signal for buzzer(H: buzzer-ON/L: buzzer-OFF)
98
P57
O
Chip select to LCD driver LSI(U3:LC868900)
99
P56
O
Chip select to LCD driver LSI(U2:LC868900)
101
P54
O
Clock to IC(U8:74HC273) for the keyboard data latch
102
P53
O
Control signal to LCD driver LSI(U2, U3:LC868900)
104
P51
O
Address bus to RAM(U42, U62)
105
P50
O
Address bus to ROM(U5)
106
VDD1
O
Power supply for this CPU
107
P30
I
108
P31
I
109
P32
I
110
P33
I
Signals for key assign from keyboard
111
P34
I
112
P35
I
113
P36
I
114
P37
I
115
P00
I/O
116
P01
I/O
117
P02
I/O
118
P03
I/O Address bus to the address data latch IC(U7:74HC373)
119
P04
I/O
120
P05
I/O
121
P06
I/O
122
P07
I/O
123
P20
O
124
P21
O
125
P22
O
126
P23
O
Address bus to ROM(U5) and RAM(U42, U62)
127
P24
O
128
P25
O
129
P26
O
130
P27
O
131
ADLC
O
Control signal to the address data latch IC(U7:74HC373)
132
-EROE
O
Chip select to ROM(U5)
133
-RST
I
Reset signal for this CPU and LCD driver LSI(U2, U3:LC868900)
134
XT1
I
Timer clock for this CPU
135
XT2
O
136
VSS
— Ground for this CPU
137
CF1
I
Main clock for this CPU
138
CF2
O
7. LSI PIN FUNCTION
CPU (LC868016A): U1
Summary of Contents for SF-5590SY
Page 19: ... 19 6 SCHEMATIC DIAGRAMS 6 1 MAIN PCB ASS Y A342054 1 4 CPU ...
Page 20: ... 20 6 1 MAIN PCB ASS Y A342054 2 4 ...
Page 21: ... 21 6 1 MAIN PCB ASS Y A342054 3 4 ...
Page 22: ... 22 6 1 MAIN PCB ASS Y A342054 4 4 ...
Page 23: ... 23 6 2 KEYBOARD PCB ASS Y A342055 1 3 COM PORT BUZZER ...
Page 24: ... 24 POWER SUPPLY 6 2 KEYBOARD PCB ASS Y A342055 2 3 ...
Page 25: ... 25 6 2 KEYBOARD PCB ASS Y A342055 3 3 ...
Page 33: ...MA0900571A ...
