Electrical pulse counters – pulse dividers – or shift registers: c – Systems – Counter controlled counter
Patent
1991-09-10
1994-02-22
Sikes, William L.
Electrical pulse counters, pulse dividers, or shift registers: c
Systems
Counter controlled counter
377 241, 377 51, 377106, 377107, H03L 700
Patent
active
052895173
ABSTRACT:
A digital pulse processing device is capable of selecting desired precision. The digital pulse processing device includes a counter group for counting pulses output from a pulse output device, the counter group having a plurality of counters A and B that can be separated from and coupled with each other, a mode control circuit for instructing separation and coupling of the counters A and B, and a control circuit for separating and coupling the counters A and B in accordance with the instruction of the mode control circuit. An overflow condition of the free-run counter B is detected using an overflow flag. Detection of an overflow is conducted by setting the flag when an overflow condition has occurred twice or more. The flag is reset by rewriting the state of the flag by a software. An overflow condition which has occurred for the first time is detected in the conventional manner and is treated as carry or borrow. A register is provided to hold the value of the counter B when a microcomputer reads in the counter B. In this way, even when .DELTA.A(i)=0, speed detection operation can be executed using the value of the counter B obtained synchronously with the counting of the counter A.
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Minami Rika
Obara Sanshiro
Ohba Mamoru
Watabe Mitsuru
Hitachi , Ltd.
Ouellette Scott A.
Sikes William L.
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