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MCB2103 User's Guide
Introduction Setup 
Theory of Operation 
Block Diagram PCB Illustration Schematics Technical Data Prototyping Area Microcontroller Power Supply Configuration JTAG Interface LEDs Push Buttons Potentiometer Serial Port Writing Programs Example ProgramsSerial Port
The MCB2103 board connects the on-chip serial UART to the MAX3221 (IC1) which converts the logic signals to RS-232 voltage levels. The UART may be used in bootstrap mode to download other utilities for debugging or downloading flash.
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.
Note
- The Flash Magic Utility uses the DTR and RTS pins to control Flash downloading. You must install jumpers J1 and J10 to program Flash with this utility.
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