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Lsi Pin Function - Casio SF-5580E Service Manual

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7. LSI PIN FUNCTION

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

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