Watchdog timer with a non-masked interrupt masked

专利名称：Watchdog timer with a non-masked

interrupt masked only when a watchdogtimer has been cleared

发明人：Tsuyoshi Katayose申请号：US07/830421申请日：19920203公开号：US05408643A公开日：19950418

摘要：A microcomputer comprises a central processing unit, a watchdog timergenerating a watchdog timer processing request when an overflow occurs in the

watchdog timer, and an interrupt controller processing as a non- maskable interrupt thewatchdog timer processing request generated by the watch timer. The centralprocessing unit generates a preset signal to the watchdog timer at a beginning ofexecution of another interrupt processing by the central processing unit, so as to presetthe watchdog timer. The interrupt controller responds to the preset signal for cancellingthe watchdog timer processing request generated by the watchdog timer in a period oftime of retaining the watchdog timer processing request by the interrupt controller.

申请人：NEC CORPORATION

代理机构：Whitham, Curtis, Whitham & McGinn

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