—
20
—
7.
LSI PIN FUNCTIONS
7-1. CPU: LSI1
Pin No.
Name
I/O
Description
1 ~ 5
C0 ~ 4
Out
Common signal for display
6
GND
In
GND 0 V
7,8
BZ1,2
Out
Buzzer terminal
9
VDD
In
Power supply terminal (+5.3 V)
10
CSRA1
Out
Chip enable signal for LSI3
11
CSRA2
Out
Chip enable signal for LSI2
12
CSROM
Out
Chip enable signal for LSI4
13
WEB
Out
Write enable signal for LSI2 and LSI3
14,15
RA15,16
Out
Address bus
16 ~ 30
A0 ~ 14
Out
Address bus
31 ~ 38
IO0 ~ 7
I/O
Data bus
39 ~ 54
KY0 ~ 15
I/O
Key signal
55
SW
In
Battery switch
Power on: 0 V off: 6 V
56
DEBUG
-
Test for manufacturer
57
ON
Out
Data communication enable signal
58
CRCKI
In
GND 0 V
59
SOUTB
Out
Transmission data output
60
SIN
In
Receiving data input
61
VDD
In
Power supply terminal (+5.3 V)
62
TEST
-
Test for manufacturer
63
VTM
-
Not used
No.1
Содержание LX-551AQ
Страница 1: ...R SF 5300E LX 551AQ JAN 1995 with price SF 5300E...
Страница 3: ...1 1 SCHEMATIC DIAGRAM 1 1 MAIN PCB...
Страница 4: ...2 1 2 KEY MATRIX 1...
Страница 37: ...MA0200651A...
