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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
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