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Table 3 summarizes the possible parallel port pins for the serial ports and their clocks.
Table 3. Rabbit 4000 Serial Port and Clock Pins
TXA
PC6, PC7, PD6
TXE
PD6, PE6, PC6
Serial Port A
RXA
PC7, PD7, PE7
RXE
PD7, PE7, PC7
Serial Port E
SCLKA
TXB
PB1
PC4, PC5, PD4
RCLKE
TCLKE
PD5, PE5, PC5
PD4, PE4, PC4
Serial Port B
RXB
SCLKB
PC5, PD5, PE5
PB0
TXF
RXF
PD2, PE2, PC2
PD3, PE3, PC3
Serial Port F
TXC
PC2, PC3
RCLKF
PD1, PE1, PC1
Serial Port C
RXC
PC3, PD3, PE3
TCLKF
PD0, PE0, PC0
SCLKC
PD2, PE2, PE7, PC7
TXD
PC0, PC1
RCLKE and RCLKF must be selected to be on the
Serial Port D
RXD
SCLKD
PC1, PD1, PE1
PD0, PE0, PE3, PC3
same parallel port as TXE and TXF respectively.
4.2.1.1 Using the Serial Ports
The receive lines on the RCM4510W serial ports do not have pull-up resistors. If you are
using the serial ports without a receiver chip (for example, for RS-422, RS-232, or RS-485
serial communication), the absence of a pull-up resistor on the receive line will likely lead
to line breaks being generated since line breaks are normally generated whenever the
receive line is pulled low. If you are operating a serial port asynchronously, you can inhibit
character assembly during breaks by setting bit 1 in the corresponding Serial Port
Extended Register to 1. Should you need line breaks, you will have to either add a pull-up
resistor on your motherboard or use a receiver that incorporates the circuits to have the
output default to the nonbreak levels.
The Dynamic C RS232.LIB library requires you to define the macro RS232_
NOCHARASSYINBRK to inhibit break-character assembly for all the serial ports.
#define RS232_NOCHARASSYINBRK
This macro is already defined so that it is the default behavior for the sample programs in
the Dynamic C SAMPLES\RCM4500W\SERIAL folder.
User ’s Manual
35
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