Microprocessor comprising a self-calibrated time base circuit

Electrical pulse counters – pulse dividers – or shift registers: c – Applications – Determining machine or apparatus operating time or...

Reexamination Certificate

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C377S044000, C327S146000, C327S151000, C327S293000

Reexamination Certificate

active

06925139

ABSTRACT:
The present invention relates to an integrated circuit comprising a first clock circuit delivering a first clock signal, a second clock circuit delivering a second clock signal, a first counting circuit for delivering a time base signal using a clock signal and a counting value, and means for applying the first clock signal and a first counting value to the first counting circuit, so as to produce a first time base signal. According to the present invention, the integrated circuit comprises means for producing a second time base signal using the second clock signal and a second counting value, and means for calibrating the second counting value such that it is equal or proportional to the number of periods of the second clock signal occurring during a determined time interval equal to a period or to a whole number of periods of the first time base signal. Application particularly to the management of a timer in a microprocessor.

REFERENCES:
patent: 5483185 (1996-01-01), Scriber et al.
patent: 5631853 (1997-05-01), Miller et al.
patent: 0 246 120 (1987-11-01), None
patent: 0 316 943 (1989-05-01), None

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