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User’s Manual
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B.1.9 Use of Rabbit 3000 Parallel Ports
Table B-6 lists the Rabbit 3000 parallel ports and their use for the RCM3700 Prototyping
Board.
Table B-6. RCM3700 Prototyping Board Use of Rabbit 3000 Parallel Ports
Port
I/O
Use
Initial State
PA0–PA7
Output
External ID0–ID7, LCD/keypad module
High (core module)
PB0
Output
CLKB, A/D Converter SCLK
High (SCLK set by driver)
PB1
Output
CLKA Programming Port
High (core module)
(when not driven by CLKA)
PB2–PB5
Output
External IA0–IA3, LCD/keypad module
High
PB6
Output
IA4, not used
High (core module)
PB7
Output
External IA5, Switch S2
High
PC0
Output
TXD RS-232
Serial Port D
High (set by drivers)
PC1
Input
RXD RS-232
Pulled up (core module)
PC2
Output
TXC RS-232
Serial Port C
High (set by drivers)
PC3
Input
RXC RS-232
Pulled up (core module)
PC4
Output
TXB Serial Flash
Serial Port B
High (set by drivers)
PC5
Input
RXB Serial Flash
Pulled up (core module)
PC6
Output
TXA Programming Port
Serial Port A
High (when not driven)
PC7
Input
RXA Programming Port
Pulled up (core module)
PD0
Output
Ethernet RSTDRV
Pulled up (core module)
PD1
Input
Ethernet BD5 (EESK)
Set by Ethernet
PD2
Input
Ethernet BD6 (EEDI)
Set by Ethernet
PD3
Input
Ethernet BD6 (EEDO)
Set by Ethernet
PD4
Output
ATXB, A/D converter SDI
High (set by driver)
PD5
Input
ARXB, A/D converter SDO
Pulled up (core module)
PD6–PD7
Input
Not used
Pulled up (core module)
PE0
Output
IrDA MD0
Pulled up (Proto Board)
PE1
Output
IrDA MD1
Pulled down (Proto Board)
PE2
Output
Ethernet AEN
High (driven by Ethernet)
PE3
Input
Not used
Pulled up (core module)
PE4
Output
IrDA FIR_SEL
Low (slow baud rate)
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