Chapter 12. Rabbit Serial Ports - Rabbit 3000 User Manual

The Rabbit 3000 has 6 on-chip serial ports designated A, B, C, D, E, and F. All the ports can per-
form asynchronous serial communications at high baud rates. Ports A-D can operate as clocked
ports. Ports A and B can be switched to alternate pins. Ports E and F support SDLC/HDLC syn-
chronous communications in addition to standard asynchronous communications. Port A has the
special capability of being used to remote boot the microprocessor via asynchronous, synchro-
nous, or IrDA (asynchronous serial).
Table 12-1 lists the synchronous serial port signals.
Serial Port
Serial Port A
Serial Port B
Serial Port C
Serial Port D
Serial Port E
User's Manual
12. R
ABBIT
Table 12-1. Serial Port Signals
Signal Name
TXA
RXA
CLKA
ATXA
ARXA
TXB
RXB
CLKB
ATXB
ARXB
TXC
RXC
CLKC
TXD
RXD
CLKD
TXE
RXE
TCLKE
RCLKE
S
ERIAL
Function
Serial Transmit Out
Serial Transmit In
Clock for clocked mode (bidirectional)
Alternate serial transmit out
Alternate serial receive in
Serial Transmit Out
Serial Transmit In
Clock for clocked mode (bidirectional)
Alternate serial transmit out
Alternate serial receive in
Serial Transmit Out
Serial Transmit In
Clock for clocked mode (bidirectional)
Serial Transmit Out
Serial Transmit In
Clock for clocked mode (bidirectional)
Serial Transmit Out
Serial Transmit In
Optional external transmit clock
Optional external receive clock
P
ORTS
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