—
21
—
22
23
24
25
26
27
28
1
2
3
4
5
6
7
21
20
19
18
17
16
15
14
13
12
11
10
9
8
OE–
A11
A9
A8
A13
WE–
VCC
A14
A12
A7
A6
A5
A4
A3
A10
CE–
IO8
IO7
IO6
IO5
IO4
GND
IO3
IO2
IO1
A0
A1
A2
CXK58257ATM
(LSI 2)
7-2.
RAM: LSI2 and LSI3 (CXK58257)
Pin No.
Name
I/O
Description
64,65
OSC I/O
I/O
Clock terminal
67,69~71
V1 ~ 4
Voltage for LCD drive
OFF: 0 V
ON– V1: 0.64 Minimum ~ 1.29 Maximum V
V2: 1.29 Minimum ~ 2.56 Maximum V
V3: 3.99 Minimum ~ 2.71 Maximum V
V4: 4.64 Minimum ~ 3.99 Maximum V
68
NC
-
Not used
72
INTO
In
Low battery detection
INTO < 5.2 V => No power on
73
STNT
In
Power supply terminal (+5.3 V)
74
VLCD
In
Power supply terminal (+5.3 V)
S0 ~ 95
Out
Segment signal for display
C5 ~ 32
Out
Common signal for display
168,200
NC
-
Not used
172 ~199
75 ~ 171
Pin No.
Name
I/O
Description
1~10,21,23~26
A0 ~ 14
In
Address bus
11~13,15~19
IO1 ~ IO8
I/O
Data bus
14
GND
In
GND 0 V
20
CE
In
Chip select signal from LSI1
22
OE
In
0 V
27
WE
In
Write enable signal from LSI1
28
VCC
In
Power supply terminal (+ 5.3 V)
Summary of Contents for LX-551AQ
Page 1: ...R SF 5300E LX 551AQ JAN 1995 with price SF 5300E...
Page 3: ...1 1 SCHEMATIC DIAGRAM 1 1 MAIN PCB...
Page 4: ...2 1 2 KEY MATRIX 1...
Page 37: ...MA0200651A...
