Difference capture timer

Details Difference capture timer Difference capture timer

1998-03-02

1999-07-20

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

059251360

ABSTRACT:
A difference capture circuit for determining the duration of a digital signal pulse. The difference circuit includes a branch couplable to a standard counter for activating the counter to count as a function of a system clock pulse, and a triggering circuit couplable to a standard capture register for fetching the count from the counter. The difference capture circuit may be incorporated into standard timer unit circuitry and is designed to calculate the difference between either the rise and fall times for an incoming signal, or the rise to rise time of that signal. Adding the difference capture circuit to a timing unit eliminates the need to use RAM, and minimizes processor resources, in obtaining the timing associated with a signal change.

REFERENCES:
patent: 4222103 (1980-09-01), Chamberlin
patent: 5218693 (1993-06-01), Ogita
patent: 5325341 (1994-06-01), Viot et al.
patent: 5633895 (1997-05-01), Powell, II et al.

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