— 16 —
Pin No.
Signal
In/Out
Function
1
DUMMY
_
Not used
2 ~ 9
IO0 ~ 7
In/Out
Data bus
10
CS6B0
Out
Chip enable signal for ROM
11
CS7B0
Out
Chip enable signal for RAM
12
DUMMY
_
Not used
13
WEB0
Out
Write enable signal for RAM
14
OEB0
Out
Output enable signal for RAM and ROM
15 ~ 31
AO0 ~ 16
Out
Address bus
32
AO17
Out
Not used
33
IT0
In
Reception data input
34
IT2
In
Interrupt signal input
35, 37
DUMMY, TRANS
_
Not used
36
BUFON
Out
Power supply control for ROM
38 ~ 44
KI1 ~ 7
In
Key input signal
45
K18
In
Not used
46 ~ 54
KO1, KO5 ~ 12
Out
Key scan signal
55
DUMMY
_
Not used
56
VREG3
Out
Power supply for RAM/3(V)
57
VLCD
Out
5.9[V]
58 ~ 61
VT1 ~ 4
_
VT1:
VT3:
1.0[V]; VT2: 2.9[V]
2.0[V]; VT4: 3.9[V]
62, 63
VREG1, 4
_
VREG1: 2.6[V]; VREG4: 5.0[V]
64
VDB
In
VDB
< 4.4[V] -> Lower battery message
65, 66
VD3, 4
_
VD3: 4.7[V]; VD4: 1.6[V]
67, 68
VD1, 2
_
VD1: 4.7[V]; VD2: 1.6[V]
69
SW1
In
2.6[V]
While pushing the reset button:0[V]
70, 71
BZ1, 2
Out
Buzzer terminal
72, 73
TS1, 2
_
Test for manufacturer
74
VREG2
Out
2[V]
75
VCC
In
Power supply /3[V]
76
DUMMY
_
Not used
77, 78
VSS
In
GND/0[V]
79 ~ 83
V0 ~ 4
Out
OFF:
ON
0[V]
V0: 3.6(Min) ~ 5.8(Max) [V]
V1: 2.9(Min) ~ 4.6(Max) [V]
V2: 2.1(Min) ~ 3.5(Max) [V]
V3: 1.4(Min) ~ 2.4(Max) [V]
V4: 0.7(Min) ~ 1.2(Max) [V]
The voltage for LCD drive
Low battery detection
7. LSI PIN FUNCTION
1. CPU (HC3009-01-F1)
