Output compare system and method automatically controlilng multi

Details Output compare system and method automatically controlilng multi Output compare system and method automatically controlilng multi

1983-11-04

1986-10-21

Thomas, James D.

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

Systems

Comparing counts

364900, H03K 2100, G06F 702

Patent

active

046189688

ABSTRACT:
An output compare system and method for automatically controlling multiple outputs in a data processor includes an output compare mask register for holding a set bit therein. An output compare data register is coupled to a control output of the output compare mask register for holding a data bit therein. Apparatus for initiating an output compare function are coupled to a control input to the output compare mask register whereby the data bit will be transferred to an output of the data processor if the set bit is present. The system and method allow for simultaneous utilization of multiple output compare functions to achieve one-cycle-wide pulses on a timer output pin.

REFERENCES:
patent: 3648254 (1972-03-01), Beausoleil
patent: 3846763 (1974-11-01), Riikonen
patent: 4222103 (1980-09-01), Chamberlin
patent: 4255785 (1981-03-01), Chamberlin
patent: 4271468 (1981-06-01), Christensen et al.
patent: 4400773 (1983-08-01), Brown et al.
patent: 4428044 (1984-01-01), Liron
patent: 4488220 (1984-12-01), Friedli et al.
Microprocessors Data Manual, Motorola Inc., 1981, pp. 3, 23 and 24.
Microprocessor Interfacing Techniques, ZAKS, 1979, SYBEX Inc., pp. 84 and 87.

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