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Software debug port for a microprocessor

  • US 6,185,732 B1
  • Filed: 08/25/1997
  • Issued: 02/06/2001
  • Est. Priority Date: 04/08/1997
  • Status: Expired due to Fees
First Claim
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1. A processor-based device provided with pins to permit connection to external electrical devices, the processor-based device comprising:

  • a processor core;

    a serial port formed of a plurality of pins configured to receive standardized serial port signals as well as signals from external non-trace capture software deDug equipment;

    control circuitry coupled to the serial port for decoding and differentiating between standardized serial port signals and signals used by the external non-trace capture software debug equipment;

    a plurality of debug registers coupled to the control circuitry and the processor core for receiving and providing debug data and control signals; and

    at least one additional pin of the serial port configured to facilitate communication between the external non-trace capture software debug equipment and the processor core, wherein the processor core is adapted to perform various software debug operations in response to signals from the external non-trace capture software debug equipment, the at least one additional pin providing an indication of the status of select software debug operations.

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