Programmable time base circuit with protected internal calibrati

Details Programmable time base circuit with protected internal calibrati Programmable time base circuit with protected internal calibrati

1988-03-02

1990-01-30

Heyman, John S.

Electrical pulse counters, pulse dividers, or shift registers: c

Systems

With programmable counter

377 30, 377 55, 3072021, H03K 2100, H03K 2300, G04C 300

Patent

active

048978604

ABSTRACT:
A timeout circuit with internal calibration includes an oscillator (11) for generating an initial frequency for division by a modulo-n counter (20). The counter (20) receives the value of n from a calibration register (22) and divides the frequency of the oscillator by the value of n. A gate (26) prevents alteration of the contents of the register (22). The output of the counter (20) provides a calibrated frequency which is further divided by a day counter (32) for output to a countdown counter (34). The countdown counter (34) provides a predetermined countdown of the signal output by the day counter (32) and, at the end of the count, generates a Timeout signal. The predetermined countdown value is determined by a value stored in a register (36) which can be protected by a customer lock out circuit (42).

REFERENCES:
patent: 3895486 (1975-07-01), Hammer et al.
patent: 3982199 (1976-09-01), Green
patent: 4015208 (1977-03-01), Hammer et al.
patent: 4140970 (1979-02-01), Graziano
patent: 4199726 (1980-04-01), Bukosky et al.
patent: 4218871 (1980-08-01), Moritani et al.
patent: 4330751 (1982-05-01), Swain
patent: 4446534 (1984-05-01), Smith
patent: 4523271 (1985-06-01), Levien
patent: 4716586 (1987-12-01), Bauer

Affiliated with

Also associated with

Rating

Programmable time base circuit with protected internal calibrati does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Programmable time base circuit with protected internal calibrati, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Programmable time base circuit with protected internal calibrati will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1928395