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Serial Port

The MCBXC866 board supports the on-chip serial UART which uses a level-shifter (IC2) to convert the logic signals to RS-232 voltage levels. The ASC0 UART may be used in bootstrap mode to download Flash programming tools or other debugging utilities.

MCBXC866 Board Serial Port

The serial UART port (COM) is configured as a standard 3-wire interface. The DB9 connector is wired to loop the PC's handshaking signals back to the PC. Refer to the figure below for details.

Serial Ports Loop Back diagram

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