User`s manual

BL4S100 User’s Manual 118
A.3 Use of Rabbit Microprocessor Parallel Ports
Table A-3 lists the Rabbit microprocessor parallel ports and their use in the BL4S100
boards.
Table A-3. Use of Rabbit Microprocessor Parallel Ports
Port I/O Signal Initial State
PA0–PA7 I/O Rabbit RIO D0–D7
Bus data line
PB0 Output PB0/SCLKB Inactive high
PB1 Input PB1/SCLKA
Driven by U12
PB2 Output Rabbit RIO PI
Bus address line
PB3–PB5 Output Rabbit RIO CH0–CHA2
PB6 Output Rabbit RIO /CS
PB7 Output Rabbit RIO G//B
PC0 Output TXD
Serial Port D
Inactive high
PC1 Input RXD Pulled up
PC2 Output TXC (A/D converter)
Serial Port C
Inactive high
PC3 Input RXC (A/D converter) Pulled up
PC4 Output TXB (serial flash)
Serial Port B
Inactive high
PC5 Input RXB (serial flash) Pulled up
PC6 Output TXA programming port
Serial Port A
Low
PC7 Input RXA programming port Pulled up
PD0 Output RabbitNet CLK Clock signal
PD1 Input XBee 1-button
PD2 Output SCLKC (A/D converter)
PD3 Input XBee reduce power
PD4 Output Rabbit RIO GS Low
PD5 Input XBee /CTS
PD6 Output TXE (XBee Tx)
Serial Port E
Inactive high
PD7 Input RXE (XBee Rx) Pulled up
PE0 Output A20
Bus address line
PE1 Input RIO interrupt input Pulled up
PE2 Output TXF (RTS)
Serial Port F
Low
PE3 Input RXF (CTS) Inactive high