Driving circuit for a microcomputer that enables sleep control u

Details Driving circuit for a microcomputer that enables sleep control u Driving circuit for a microcomputer that enables sleep control u

1995-07-07

1998-04-07

Butler, Dennis M.

395559, 395560, 395750, G06F 104

Patent

active

057375887

ABSTRACT:
For a system which receives a sleep command to terminate the application of machine clock signals to a microprocessor and which clocks control execution time and stabilization time after the return from sleep control and resumes the supply of the machine clock signal, the clocking device for each of the time durations is implemented using a small-scale timing device. Following a sleep command from a microprocessor, sleep control, which terminates the operation of the main oscillator and the machine clock generation circuit that generates the machine clock signal based on the oscillation of the main oscillator, is started. Then, counting the oscillation signal from an RC oscillator used for clocking using an RC timer, the lapse time after starting sleep control is started and if the clocked time reaches a predetermined time, the main oscillator is reactivated. After reactivating the main oscillator, the RC timer is reset so that it begins to count the time thereafter starting from "0" and if the clocked time reaches the time needed for the oscillation of the main oscillator to stabilize, the machine clock generation circuit resumes its operations.

REFERENCES:
patent: 4758945 (1988-07-01), Remedi
patent: 5083266 (1992-01-01), Watanabe
patent: 5167024 (1992-11-01), Smith et al.
patent: 5390350 (1995-02-01), Chung et al.

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