Counter circuit with direction of count indication

Details Counter circuit with direction of count indication Counter circuit with direction of count indication

1991-06-28

1993-04-27

Heyman, John S.

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

Systems

Including reversible counter

379 55, 379 56, H03K 2102, H03K 2108, H03K 2118

Patent

active

052068900

ABSTRACT:
A counter circuit comprises a signal detector for providing an up/down indication signal and a count clock signal according to an up/down signal and a reference clock signal. A n-bit counter for providing up/down count data of "n" bits according to the up/down indication signal and count clock signal. A counting direction detector provides a counting direction signal according to the up/down indication signal and reference clock signal. This counter circuit itself determines whether it is counting up or counting down, by hardware, and thus can instantaneously respond to a direction identification request from a central processing unit.

REFERENCES:
patent: 4532643 (1985-07-01), Thompson
patent: 4628521 (1986-12-01), Nishimura et al.
patent: 4881248 (1989-11-01), Korechika
patent: 4982413 (1991-01-01), Hauck et al.

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