Serial Programming Port - Rabbit RCM3000 User Manual

4.2.3 Serial Programming Port

The RCM3000 serial programming port is accessed using header J3 or over an Ethernet
connection via the RabbitLink EG2110. The programming port uses the Rabbit 3000's
Serial Port A for communication. Dynamic C uses the programming port to download and
debug programs.
The programming port is also used for the following operations.
• Cold-boot the Rabbit 3000 on the RCM3000 after a reset.
• Remotely download and debug a program over an Ethernet connection using the
• Fast copy designated portions of flash memory from one Rabbit-based board (the
Programming may also be initiated through the motherboard to which the RCM3000
series module is plugged in to since the Serial Port A (PC6 and PC7), SMODE0, SMODE1,
and /RESET_IN are available on headers J1 and J2 (see Table 2).
Alternate Uses of the Serial Programming Port
All three clocked Serial Port A signals are available as
• a synchronous serial port
• an asynchronous serial port, with the clock line usable as a general CMOS input
The serial programming port may also be used as a serial port via the
the serial programming cable.
In addition to Serial Port A, the Rabbit 3000 startup-mode (SMODE0, SMODE1), status,
and reset pins are available on the serial programming port.
The two startup-mode pins determine what happens after a reset—the Rabbit 3000 is
either cold-booted or the program begins executing at address 0x0000.
The status pin is used by Dynamic C to determine whether a Rabbit microprocessor is
present. The status output has three different programmable functions:
1. It can be driven low on the first op code fetch cycle.
2. It can be driven low during an interrupt acknowledge cycle.
3. It can also serve as a general-purpose CMOS output.
The /RESET_IN pin is an external input that is used to reset the Rabbit 3000 and the
RCM3000 onboard peripheral circuits. The serial programming port can be used to force a
hard reset on the RCM3000 by asserting the /RESET_IN signal.
Refer to the
User's Manual
Downloaded from Elcodis.com electronic components distributor
RabbitLink EG2110.
master) to another (the slave) using the Rabbit Cloning Board.
Rabbit 3000 Microprocessor User's Manual
DIAG connector on
for more information.
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