Lsi Pin Function - Casio JD-5500 Service Manual

7. LSI PIN FUNCTION

1. CPU (HC3009-01-F1)
Pin No.
1
2 ~ 9
10
11
12
13
14
15 ~ 31 AO0 ~ 16
32
33
34
35, 37 DUMMY, TRANS
36
38 ~ 44
45
46 ~ 54 KO1, KO5 ~ 12
55
56
57
58 ~ 61
62, 63 VREG1, 4
64
65, 66
67, 68
69
70, 71
72, 73
74
75
76
77, 78
79 ~ 83
Signal In/Out
DUMMY _
IO0 ~ 7 In/Out
CS6B0 Out
CS7B0 Out
DUMMY _
WEB0 Out
OEB0 Out
Out
AO17 Out
IT0 In
IT2 In
_
BUFON Out
KI1 ~ 7 In
K18 In
Out
DUMMY _
VREG3 Out
VLCD Out
VT1 ~ 4 _
_
VDB In
VD3, 4 _
VD1, 2 _
SW1 In
BZ1, 2 Out
TS1, 2 _
VREG2 Out
VCC In
DUMMY _
VSS In
V0 ~ 4 Out
— 16 —
Function
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]; VREG4: 5.0[V]
Low battery detection
VDB < 4.4[V] -> Lower battery message
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]