Watchdog timer with a non-masked interrupt masked only when a watchdog timer has been cleared
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United States of America Patent
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Apr 18, 1995
Grant Date -
N/A
app pub date -
Feb 3, 1992
filing date -
Feb 1, 1991
priority date (Note) -
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status (Latency Note)
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Abstract
A microcomputer comprises a central processing unit, a watchdog timer generating a watchdog timer processing request when an overflow occurs in the watchdog timer, and an interrupt controller processing as a non-maskable interrupt the watchdog timer processing request generated by the watch timer. The central processing unit generates a preset signal to the watchdog timer at a beginning of execution of another interrupt processing by the central processing unit, so as to preset the watchdog timer. The interrupt controller responds to the preset signal for cancelling the watchdog timer processing request generated by the watchdog timer in a period of time of retaining the watchdog timer processing request by the interrupt controller.
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