Microcomputer including a circuit for generating a reset signal

Details Microcomputer including a circuit for generating a reset signal Microcomputer including a circuit for generating a reset signal

1995-07-06

1998-02-24

Butler, Dennis M.

395560, 395750, G06F 124

Patent

active

057218870

ABSTRACT:
A microcomputer in which a voltage drop in a power source is detected by a voltage detecting circuit, and a capacitor is connected to a first power source and/or a second power source on the basis of a detection signal of said detecting circuit thereby to be charged/discharged, so that a reset signal is generated. The supply of a clock signal is controlled on the basis of said detection signal. When a source voltage of the microcomputer is found to be lower than a reference voltage but recovering in a short time, it is possible to resume a programmed operation from a temporary cut-off state without initializing the program.

REFERENCES:
patent: 4464584 (1984-08-01), Hentzschel et al.
patent: 4701856 (1987-10-01), DiGiulio et al.
patent: 5400341 (1995-03-01), Makino et al.
patent: 5454114 (1995-09-01), Yach et al.
patent: 5539910 (1996-07-01), Brueckmann et al.

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