Lsi Pin Functions; Cpu:lsi1 - Casio SF-5300E Service Manual & Parts List

7. LSI PIN FUNCTIONS

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