Electrical computers and digital processing systems: support – Clock – pulse – or timing signal generation or analysis – Counting – scheduling – or event timing
Patent
1998-06-03
2000-05-02
Heckler, Thomas M.
Electrical computers and digital processing systems: support
Clock, pulse, or timing signal generation or analysis
Counting, scheduling, or event timing
G06F 104
Patent
active
060584874
ABSTRACT:
The present invention provides a period measuring circuit comprising: a timer for receiving a timer count clock signal and executing a counting operation; a detection circuit receiving an input signal to detect an edge of the input signal and output a detection signal; a capture register connected to the detection circuit and also to the timer to capture a current value counted by the timer upon receipt of the detection signal; and a control circuit connected between the detection circuit and the capture register, the control circuit comparing a frequency of the detection signal with a predetermined critical frequency value and if the frequency of the detection signal exceeds the critical frequency, then the capture register is disconnected from the detection circuit to terminate period measurement, and if the frequency of the detection signal does not exceed the critical frequency, the control circuit connects the capture register to the detection circuit whereby the capture register receives the detection signal and simultaneously clears the timer.
REFERENCES:
patent: 4965502 (1990-10-01), Ogasawara
patent: 4994723 (1991-02-01), Tabuchi
Siemens: CR167 User's Manual, Munich, Feb. 1996, pp. 2-1, 2-14, 9-1, 9-16, 9-17, 9-20, 9-23, 9-24, 9-28.
Heckler Thomas M.
NEC Corporation
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