| 摘要 |
A microcomputer interval counter circuit for detecting the time interval between input signals and for determining when the detected time interval exceeds a preset time interval. The interval counter circuit includes a latch connected to a bus of the microcomputer for storing the preset time interval duration, a counter circuit connected to the latch and to the microcomputer clock for decrementing a number stored in the counter and producing a timing indication as an interrupt to the microcomputer processor, and an OR gate connected to load the counter from the latch when an input signal is received, or when the counter circuit fully decrements.
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