Electrical pulse counters – pulse dividers – or shift registers: c – Systems – Counter controlled counter
Patent
1989-07-24
1992-05-05
Heckler, Thomas M.
Electrical pulse counters, pulse dividers, or shift registers: c
Systems
Counter controlled counter
377110, 368 70, 368188, H03K 2300
Patent
active
051114879
ABSTRACT:
Modulo timer apparatus including a chain of modulo counter stages is controllable by write signals generated by a central controller. The central controller is operative to generate a write signal corresponding to a selected counter stage, and a digital control signal. The initial counter stage of the chain includes a selecting circuit controlled by the digital control signal to couple either a reference clock signal or the corresponding write signal to the initial counter stage to alter the count thereof. Each successive counter stage includes a corresponding selecting circuit also controlled by the digital control signal to couple either a pulse signal generated from the preceding counter stage as it counts through its modulus value or the corresponding write signal to the successive counter stage to alter the count thereof. In one embodiment, the timer apparatus is a real time clock including at least seconds, minutes, and hours modulo counter stages which are interconnectly responsive to a reference time base clock signal to accumulate a count indicative of the real time. A method of testing the plurality of interconnected counter stages of the timer apparatus utilizing the write signals generated by the central controller is also described.
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patent: 4879733 (1989-11-01), Burch et al.
Berry Thomas G.
Heckler Thomas M.
Ingrassia Vincent B.
Motorola Inc.
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