Microprocessor hold and lock circuitry

Details Microprocessor hold and lock circuitry Microprocessor hold and lock circuitry

1989-06-19

1992-12-08

Fleming, Michael R.

Boots, shoes, and leggings

36424292, 364DIG1, 36493701, 36492691, 364DIG2, G06F 1300

Patent

active

051704811

ABSTRACT:
A logic circit external to a microprocessor monitors selected processor I/O pins to determine the current processor cycle and, in response to a hold request signal, drives the processor into a hold state at the appropriate time in the cycle. The logic circuit also includes a "lockbus" feature that, when the processor is not idle, "locks" the microprocessor to the local CPU bus for a predetermined period of time immediately after the processor is released from a hold state.

REFERENCES:
patent: 4547849 (1985-10-01), Louie et al.
patent: 4611297 (1986-09-01), Dudley et al.
patent: 4729090 (1988-03-01), Baba
patent: 4779089 (1988-10-01), Theus
patent: 4787032 (1988-11-01), Culley
patent: 4807112 (1989-02-01), Hamasaki
patent: 4987529 (1991-01-01), Graft et al.

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