Register access decade counting technique

Details Register access decade counting technique Register access decade counting technique

1987-11-13

1989-06-13

Heyman, John S.

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

Applications

Measuring or testing

377 34, 377 54, 377 67, 377114, 365236, 365240, H03K 2116, H03K 2112, G11C 700, G11C 2100

Patent

active

048399094

ABSTRACT:
An electronic counter such as for use in the odometer of a motor vehicle is provided comprising an array (10) of m rows and n columns of single flip-flop data latches and a central shifting unit (14). The central shifting unit (14) comprises a row of n data latches arranged to read data from and write data to each of the m rows of data latches of the array (10). In operation, the central shifting unit (14) reads data from a row of data latches of the array, performs a shift operation on the data and an invert operation on one of n data latches of the central shifting unit (14) and returns the data so operated on to the row of data latches in the array (10). By these steps, a counting operation in Johnson code is performed on the data. This invention uses less chip area than known counters.

REFERENCES:
patent: 3316540 (1967-04-01), Nissim
patent: 3764782 (1973-10-01), Spauszug et al.
patent: 3851313 (1974-11-01), Chang
patent: 3984815 (1976-10-01), Drexler et al.
patent: 4663770 (1987-05-01), Murray et al.
patent: 4757522 (1988-07-01), Kieselstein

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