— 12 —
Pin No.
Signal
I/O
Function
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/5.3[V]
10
CSRA1
Out
Chip enable signal (Not used)
11
CSRA2
Out
Chip enable signal for RAM
12
CSROM
Out
Chip enable signal for ROM (only used in LX-546AQ)
13
WEB
Out
Write enable signal for RAM
14,15
RA15,16
Out
Address bus for ROM (only used in LX-546AQ)
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 (On: "L"/0[V] Off: "H"/6[V])
56
DEBUG
-
Test for manufacturer
57
ON
Out
Data communication enable
58
CRCKI
In
GND/0[V]
59
SOUTB
Out
Transmission data output
60
SIN
In
Transmission data input
61
VDD
In
Power supply/5.3[V]
62
TEST
-
Test for manufacturer
63
VTM
-
Not used
6.
LSI, IC (Pin function)
6-1. CPU
No.1
Summary of Contents for SF-4300R
Page 1: ...R with price SF 4300R LX 546 OCT 1994 SF 4300R ...
Page 3: ... 1 1 SCHEMATIC DIAGRAM 1 1 MAIN PCB ...
Page 4: ... 2 1 2 KEY MATRIX ...
Page 27: ...MA0100451A ...
