Electrical pulse counters – pulse dividers – or shift registers: c – Systems – With programmable counter
Patent
1982-02-03
1984-08-28
Heyman, John S.
Electrical pulse counters, pulse dividers, or shift registers: c
Systems
With programmable counter
377 44, 377 47, H03K 2130
Patent
active
044687974
ABSTRACT:
The swallow counter includes a two modulus prescaler which selectively divides a frequency of an input pulse according to a signal level of a control signal for producing a frequency divided signal, a first programmable counter which starts counting in response to the frequency divided signal to produce a first code signal, a second programmable counter which starts counting in response to the first code signal for producing a second code signal, a first code detector for detecting a specific code signal of the first and second code signals to produce a first pulse signal, a third programmable counter which, in response to the frequency divided signal, starts to count for producing a third code signal, a second code detector for detecting a specific bit of the third code signal for producing a second pulse signal utilized as a reset signal of the first to third programmable counters, a flip-flop circuit for selectively outputting a reset or set signal in response to the first or second pulse signal, and a period counter responsive to the reset or set signal for producing a first or second level of the control signal.
REFERENCES:
patent: 4053739 (1977-10-01), Miller et al.
patent: 4184068 (1980-01-01), Washburn
patent: 4244027 (1981-01-01), Shai
Motorola Semiconductor Products Inc., Phase-Locked Loop: General Information; 1973; pp. 8-11.
Heyman John S.
OKI Electric Industry Co., Ltd.
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