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User’s Manual
83
PF0
Output
ADC Serial Clock
Inactive high
PF1
Input
ADC Busy
Inactive low
PF2
Input
Not used
Pulled up
PF3
Output
ADC Device Select
Inactive high
PF4
Output
PWM0
Inactive high
PF5
Output
PWM1
Inactive high
PF6
Output
PWM2
Inactive high
PF7
Output
Power Enable Control
Low when external power
source is connected; high
for battery
PG0
Output
RS-485 Transmit Enable
Inactive low
PG1
Output
RS-232 Shutdown Control
Inactive high
PG2
Output
TxF RS-485
Serial Port F
Inactive high
PG3
Input
RxF RS-485
Inactive high
PG4
Output
Relay Set
Inactive low
PG5
Output
Relay Reset
Inactive low
PG6
Output
TxE RS-232
Serial Port E
Inactive high
PG7
Input
RxE RS-232
Inactive high
Table A-3. Use of Rabbit 3000 Parallel Ports (continued)
Port
I/O
Signal
Output Function State
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