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US 6,664,825 B2Granted
Reset function incorporated microcomputer
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsTadayoshi Ishikawa, Junji Nakatsuka, Hiroya Ueno, Yoshinobu Tokuno
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Abstract
The reset function incorporated microcomputer of the present invention, capable of suppressing a variation in reset voltage with a simple configuration, includes a reset decision section. In the reset decision section, a band gap reference circuit generates a predetermined reference voltage VA. A voltage dividing resistance generates a reset voltage VR from the reference voltage VA. A comparator compares the supply voltage VDD applied to the microcomputer with the reset voltage VR, and outputs a reset signal SR.
Claims5
A microcomputer comprising:
- a reset decision control section that generates a control signal;
- and
- a reset decision section that generates a reset signal instructing execution or non-execution of reset operation in response to the control signal,
- the reset decision section comprising:
- a stabilized power supply circuit for generating a predetermined reference voltage;
- a reset voltage generation circuit for generating a reset voltage based on the reference voltage generated by the stabilized power supply circuit;
- and
- a comparator for comparing a supply voltage applied to the microcomputer with the reset voltage, the reset signal being generated based on the comparison result from the comparator and the control signal.
5 more elements
Dependencies are inferred from the claim text.