20-101-1215 Rabbit Semiconductor, 20-101-1215 Datasheet - Page 40

• Manufacturer Part Number: 20-101-1215
• Description: MCU RCM4050 RABBITCORE
• Manufacturer: Rabbit Semiconductor

Specifications of 20-101-1215

• Module/board Type: MPU Core Module
• For Use With/related Products: RCM4050
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 316-1145

4.2 Serial Communication
The RCM4000 module does not have any serial transceivers directly on the board. How-
ever, a serial interface may be incorporated on the board the RCM4000 is mounted on. For
example, the Prototyping Board has an RS-232 transceiver chip.
4.2.1 Serial Ports
There are five serial ports designated as Serial Ports A, B, C, D, and F. All five serial ports
can operate in an asynchronous mode up to the baud rate of the system clock divided by 8.
An asynchronous port can handle 7 or 8 data bits. A 9th bit address scheme, where an
additional bit is sent to mark the first byte of a message, is also supported.
Serial Port A is normally used as a programming port, but may be used either as an asyn-
chronous or as a clocked serial port once application development has been completed and
the RCM4000 is operating in the Run Mode.
Serial Port B is shared by the RCM4000 module’s A/D converter, and is set up as a
clocked serial port. Since this serial port is set up for synchronous serial communication
on the RCM4000 model, you will lose the A/D converter’s functionality if you try to use
the serial port in the asynchronous mode. Serial Port B is available without any restrictions
on the RCM4010.
Serial Ports C and D can also be operated in the clocked serial mode. In this mode, a clock
line synchronously clocks the data in or out. Either of the two communicating devices can
supply the clock.
Serial Port F, which is available as a matter of course on the RCM4010 and can be used
instead of Serial Port C on Parallel Port C pins 2 and 3, can also be configured as an
SDLC/HDLC serial port. The IrDA protocol is also supported in SDLC format by this
serial port. Serial Port F must be configured before it can be used. The sample program
in the Dynamic C
folder
IOCONFIG_SWITCHECHO.C
SAMPLES\RCM4000\SERIAL
shows how to configure Serial Port F.
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RabbitCore RCM4000