| 摘要 |
The invention provides apparatus and method to verify appropriate program execution. Hardware external to a processor includes a resettable timer and a shift register for storing and shifting a bit pattern. Internally of the processor a bit pattern is also manipulated by a routine which also outputs a clock signal. A selected bit from each of the patterns is compared on each clock signal. If the clock signal repeats at a sufficiently rapid rate to keep the timer from expiring and, if the comparison is favorable, the processor is allowed to run; otherwise it is reset.
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