Non-volatile counting circuit and method which provides for exte

Details Non-volatile counting circuit and method which provides for exte Non-volatile counting circuit and method which provides for exte

1986-02-24

1987-05-05

Heyman, John S.

Electrical pulse counters, pulse dividers, or shift registers: c

Systems

Identifying or correcting improper counter operation

377 39, 377 44, 377 24, 377 15, 364900, 371 4, H03K 2140

Patent

active

046637702

ABSTRACT:
Counter circuit apparatus which sequentially re-allocates lower-order counting operation in order to extend counter life. The counter is comprised of a plurality of lower order counters and at least one higher order counter. A count selection circuit is coupled to the plurality of counters which controls the counting thereof in response to applied event input signals. A map control circuit is coupled between the higher order counter and the count selection circuit which controls the count selection circuit in response to signals derived from the higher order counter. The map control circuit sequentially enables a predetermined one of the lower order counters to count individual ones of the applied event input signals. A count unscrambling circuit is coupled to the plurality of lower order counters and the map control circuit which produces an ordered count output signal that is indicative of the number of event input signals counted by the counter. The operating lifetime of the counters is increased utilizing the principles of the present invention. One application of the present invention is that of a non-volatile up counter suitable for an odometer application. A counting method which provides for extended counter life is also disclosed.

REFERENCES:
patent: 3526758 (1970-09-01), Nozawa
patent: 4214152 (1980-07-01), Hess
patent: 4319355 (1982-03-01), Mollier
patent: 4453210 (1984-06-01), Suzuki et al.
patent: 4559637 (1985-12-01), Weber

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