Programmable time base circuit with protected internal calibration
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United States of America Patent
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-
Jan 30, 1990
Grant Date -
N/A
app pub date -
Mar 2, 1988
filing date -
Mar 2, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
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).
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