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Serial Port

The MCB1000 board connects the on-chip serial UART to the ST3232 (IC6) which converts the logic signals to RS-232 voltage levels.

MCB1000 Board Serial I/O

In addition to the standard 3-wire interface, the COM DB9 connector is wired to allow a board RESET via the DTR pin, and to enable In-System Programming (ISP) via the RTS pin as shown in the figure below.

DB9 Connector Wiring for RESET and ISP

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