Microcomputer with watchdog timer and I/O port control

Details Microcomputer with watchdog timer and I/O port control Microcomputer with watchdog timer and I/O port control

1991-08-22

1995-04-04

Bowler, Alyssa H.

Excavating

371 91, 395575, 395800, G06F 1100

Patent

active

054043565

ABSTRACT:
In a semiconductor device such as a one-chip microcomputer having therein a runaway monitor (watch dog timer) there is provided a control unit for directly controlling the state of an input/output port on the basis of an output (overflow signal) of the runaway monitor and for controlling, in response to the detection of the runaway, the input/output port so that only the input of the input/output port becomes effective. This arrangement can separate the semiconductor device from an external system at the real time when the semiconductor device enters into the runaway state.

REFERENCES:
patent: 4307447 (1981-12-01), Provanzano et al.
patent: 4314334 (1982-02-01), Daughton et al.
patent: 4488303 (1984-12-01), Abramovich
patent: 4535404 (1985-08-01), Shenk
patent: 4610013 (1986-09-01), Long et al.
patent: 4625308 (1986-11-01), Kim et al.
patent: 4879647 (1989-11-01), Yazawa
patent: 5068853 (1991-11-01), Soma et al.
"Ein Mikrocontroller fur Steuerungswecke," Gunter Michels, Der Elektroniker, Jul. 1988, translated inserts only.

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