— 23 —
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 si
nal to RAM
U42, U62
and LCD driver LSI
U2, U3:LC868900
85 P47 O Write si
nal 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
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