Window type watchdog timer and semiconductor device
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United States of America Patent
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Aug 30, 2022
Grant Date -
Jun 11, 2020
app pub date -
Dec 2, 2019
filing date -
Dec 6, 2018
priority date (Note) -
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Abstract
A window type watchdog timer includes a frequency dividing circuit for generating a frequency-divided clock signal by dividing a frequency of a reference clock signal; a monitoring circuit for monitoring occurrence of a first error in which clear control from a target device is interrupted for a first time or more, and occurrence of a second error in which an interval between two consecutive clear controls from the target device is shorter than a second time shorter than the first time, based on the frequency-divided clock signal; and outputting an error signal when the first error or the second error is detected; and a setting circuit for variably setting the first time and the second time by variably setting a frequency division ratio in the frequency dividing circuit and variably setting a detection condition of the first error and the second error.
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