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danielh1
Visitor II
September 14, 2003
Question

BEWARE OF THE DOG

  • September 14, 2003
  • 2 replies
  • 595 views
Posted on September 14, 2003 at 11:58

BEWARE OF THE DOG

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    2 replies

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    danielh1Author
    Visitor II
    May 17, 2011
    Posted on May 17, 2011 at 11:55

    The documentation about the watchdog timer is very inaccurate and completely misleading.

    1 - The watchdog timer is a down counter: it decrements once at every machine cycle, and overflows from 0 to 3FFFFFH (unless reset before).

    2 - The value written in the WDRST register is indeed loaded into the 7 MSB of the timer: the greater this value, the longer the period.

    3 - The WDRST value may range from 1 (minimum) to 7F (maximum). A value of 0 STOPS the timer.

    4 - For some misterious reason, writing to the PCON register resets the watchdog timer to its maximum value (7F).

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    danielh1Author
    Visitor II
    May 17, 2011
    Posted on May 17, 2011 at 11:55

    I forgot to mention which chip I'm referencing: uPSD3234A and uPSD3254A

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