ViewSonic VA712b-2, Service Manual

Page: 22 / 91

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ViewSonic Corporation
PIN Function
Pin No.
Name
PLCC QFP
DESCRIPTION
NC 1 39
No connection
DA0/P5.0 2 40
PWM DAC output/General purpose I/O (open drain)
DA1/P5.1 3 41
PWM DAC output/General purpose I/O (open drain)
DA2/P5.2 4 42
PWM DAC output/General purpose I/O (open drain)
DA3/P5.3 5 43
PWM DAC output/General purpose I/O (open drain)
DA4/P5.4 6 44
PWM DAC output/General purpose I/O (open drain)
DA5/P5.5 7 1
PWM DAC output/General purpose I/O (open drain)
P5.6/HSCL2 8 2
General purpose I/O/Slave llC1 SCL2
（
open drain
）
P5.7/HSDA2 9 3
General purpose Output/Slave llC1 SCL2
（
open drain
）
RST 10 4
High Active RESET
HSCL1/P3.0/RXD 11 5
Slave IIC clock/General purpose I/O/Rxd (open drain)
HSDA1/P3.1/RXD 13 7
Slave IIC clock/General purpose I/O/Txd (open drain)
P3.2/INT0 14 8
General purpose I/O/External interrupt 0(Standard 8051)