Asynchronous debug interface

Details Asynchronous debug interface Asynchronous debug interface

2006-08-08

2006-08-08

Ton, David (Department: 2138)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital logic testing

C714S742000

Reexamination Certificate

active

07089467

ABSTRACT:
Apparatus and methods are described for a background microcontroller debugger. A method to debug a microcontroller includes sending a three level signal from a debug module, receiving the three level signal at a single pin on an MCU, sending a second three level signal from the single pin on the MCU, and receiving the second three level signal at the debug module. An apparatus to debug a microcontroller includes a tri-statable pad driver to transmit a three level signal, a reference voltage divider coupled to the tri-statable pad diver, a plurality of voltage comparators to receive the three level signal, a resistive voltage divider to maintain thresholds for the plurality of voltage comparators, and a plurality of logic elements coupled to the plurality of voltage comparators to receive the three level signal.

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patent: 6564351 (2003-05-01), Loughmiller
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patent: 6915416 (2005-07-01), Deng et al.
patent: 6944794 (2005-09-01), Okabayashi et al.

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