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Lsi Pin Function - Casio JD-4000BK Service Manual

Dec. 1994

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7. LSI PIN FUNCTION

1. CPU (HC3009-01-F1)
Pin No.
Signal
1
DUMMY
2 ~ 9
IO0 ~ 7
10
CS6B0
11
CS7B0
12
DUMMY
13
14
15 ~ 31
AO0 ~ 16
32
33
34
35, 37
DUMMY, TRANS
36
BUFON
38 ~ 44
KI1 ~ 7
45
46 ~ 54
KO1, KO5 ~ 12
55
DUMMY
56
VREG3
57
58 ~ 61
VT1 ~ 4
62, 63
VREG1, 4
64
65, 66
VD3, 4
67, 68
VD1, 2
69
70, 71
72, 73
74
VREG2
75
76
DUMMY
77, 78
79 ~ 83
84
85 ~ 108
C1 ~ 24
In/Out
_
In/Out
Out
Out
_
WEB0
Out
OEB0
Out
Out
AO17
Out
IT0
In
IT2
In
_
Out
In
K18
In
Out
_
Out
VLCD
Out
_
_
VDB
In
_
_
SW1
In
BZ1, 2
Out
TS1, 2
_
Out
VCC
In
_
VSS
In
V0 ~ 4
Out
VSSR
In
Out
Not used
Data bus
Chip enable signal for ROM
Chip enable signal for RAM
Not used
Write enable signal for RAM
Output enable signal for RAM and ROM
Address bus
Not used
Reception data input
Interrupt signal input
Not used
Power supply control for ROM
Key input signal
Not used
Key scan signal
Not used
Power supply for RAM/3(V)
5.9[V]
VT1:
1.0[V];
VT2: 2.9[V]
VT3:
2.0[V];
VT4: 3.9[V]
VREG1: 2.6[V];
Low battery detection
VDB
< 4.4[V]
VD3: 4.7[V];
VD4: 1.6[V]
VD1: 4.7[V];
VD2: 1.6[V]
2.6[V]
While pushing the reset button:0[V]
Buzzer terminal
Test for manufacturer
2[V]
Power supply /3[V]
Not used
GND/0[V]
The voltage for LCD drive
OFF:
0[V]
ON
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]
GND/0[V]
Common signal display
— 14 —
Function
VREG4: 5.0[V]
-> Lower battery message

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