Special function unit with interrupt latches for programmable co

Details Special function unit with interrupt latches for programmable co Special function unit with interrupt latches for programmable co

1989-03-29

1991-09-24

Chan, Eddie P.

Boots, shoes, and leggings

3649423, 364949, 364140, G06F 900

Patent

active

050519450

ABSTRACT:
In a special function unit which controls external equipment according to an output signal of a programmable controller, flip-flop circuits latch the output signals of the programmable controller, an OR circuit provides interruption inputs according to the output signals thus latched, an input circuit discriminates the output signals thus latched, and a microprocessor, according to the interruption input and the output of the input circuit, carries out an interruption process to control the external equipment. At the end of the interuption process, the microprocessor resets the flip-flop circuits which have latched the output signals, with the result that the special function unit can quickly respond to instructions from the programmable controller and can start the processing operation uniformly.

REFERENCES:
patent: 3651484 (1972-03-01), Smeallie
patent: 3771146 (1973-11-01), Cotton et al.
patent: 4004283 (1977-01-01), Bennett et al.
patent: 4309754 (1982-01-01), Dinwiddie, Jr.

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