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Serial Ports

The MCB1700 board connects the ASC0 on-chip serial UART to the ST3232 (IC6), which converts the logic signals to RS-232 voltage levels. The ASC0 UART may be used in bootstrap mode to download other utilities for debugging or downloading flash.

MCB1700 Board Serial Ports

In addition to the standard 3-wire interface, the COM0 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

The COM1 DB9 connector uses the standard 3-wire interface and does not connect the DTR or RTS pins to any board component as shown in the figure below.

DB9 Connector Standard Wiring

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