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MCB520: SERIAL PORT EXAMPLES IN MANUAL DO NOT WORK


Information in this article applies to:

  • MCB520 Evaluation Boards
  • C51 Version 5.50

SYMPTOMS

When I try and run the example serial port programs in the MCB520 manual either the monitor appears to stop working or I get garbage out of Serial Port 0. Why?

CAUSE

The example programs are incorrect. They were written based on the assumption that the monitor uses Serial Port 0 and timer 2 for communications with dScope. This is incorrect. The monitor uses Serial Port 1 and timer 1. The examples all modify timer 1, which stops the monitor from working.

RESOLUTION

Modify the examples so they use timer 2. Then, communications between the PC and monitor will not be disrupted.

MORE INFORMATION

For more information about the MCB520 evaluation board, refer to the following URL: http://www.keil.com/mcb520

Last Reviewed: Thursday, May 26, 2005


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