BL4S200 User’s Manual
177
A.4 Use of Rabbit Microprocessor Parallel Ports
Table A-3 lists the Rabbit microprocessor parallel ports and their use in the BL4S200
boards.
Table A-3. Use of Rabbit Microprocessor Parallel Ports
Port
I/O
Signal
Initial State
PA0–PA7
I/O
ID0–ID7
Pulled up
PB0
Input
ADC busy (BL4S210)
Pulled up
PB1
Input
Not connected
Pulled up
PB2–PB7
Output
IA0–IA5
High
PC0
Output
TXD SPI
Serial Port D
Inactive high
PC1
Input
RXD SPI
Pulled up
PC2
Output
TXC RS-485
Serial Port C
Inactive high
PC3
Input
RXC RS-485
Pulled up
PC4
Output
TXB RS-232 (BL4S210)
Serial Port B
Inactive high
PC5
Input
RXB RS-232 (BL4S210)
Pulled up
PC6
Output
TXA Programming Port
Serial Port A
Low
PC7
Input
RXA Programming Port
Pulled up
PD0–PD1
Output/ENET
Not connected
PD2
Output
TXF RS-232
(except BL4S210)
Serial Port F
Low
PD3
Output
RXF RS-232
(except BL4S210)
Low
PD4–PD5
Output
Not connected
Low
PD6
Output
TXE RS-232
(except BL4S210)
Serial Port E
Low
PD7
Output
RXE RS-232
(except BL4S210)
Low
PE0
Output
RIO I/O enable
Inactive high
PE1
Input
RIO interrupt input
Pulled up
PE2
Output
RIO Global Synch
Low
PE3
Output
SPI SCLKD
Inactive high
PE4
Input
ADC busy
Pulled up
PE5
Input
Not connected
Pulled up
PE6–PE7
Output
Not connected
Low
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