RPR 550IS Series
TM1188 Issue 1 Page 5 - 25
Table 8: IC3, Microprocessor Pin Connections
PIN NAME DESCRIPTION
1P72
To switch outputs on IC2, the gate array2P71
3P70
4P63
Bi-directional data bus
5P62
6P61
7P60
8 P53 Speech enable
10 P51 SBY (display enable)
11 P50 Display V
DD
enable
13 P43 Display DB7
14 P42 Display DB6
15 P41 Display DB5
16 P40 Display DB4
17 V
SS
Ground
18 XT1 Ground
20 RESET Reset
21 X1
Oscillator circuit
22 X2
23 P33 To Register Select on IC2
24 P32 To Read/Write on IC2
25 P31 To Data transfer clock on IC2
26 P30 To Chip Select on IC2
27 P81 Pull-up resistor
28 P80 ARDATA (Absence Rack Data)
29 P03/ST/SBI
EEPROM SDA
30 P02
31 P01/SCK EEPROM SCL
32 INT4/P00 To Data interrupt on IC2
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