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Integrated circuit and operation method thereof

  • US 9,575,535 B2
  • Filed: 07/01/2014
  • Issued: 02/21/2017
  • Est. Priority Date: 10/09/2013
  • Status: Active Grant
First Claim
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1. An integrated circuit, comprising:

  • a voltage detecting unit configured to detect a system voltage and correspondingly output a voltage state signal;

    a central processing unit having at least one register, coupled to the voltage detecting unit for receiving the system voltage, and configured to determine whether to start operating according to the voltage state signal;

    a memory unit; and

    a control unit coupled to the voltage detecting unit, the central processing unit and the memory unit, and configured to receive the voltage state signal and the system voltage, and when the system voltage is downed to a voltage level lower than or equal to a brown-out voltage and greater than a reset low voltage, the central processing unit entering an idle state and the control unit storing values of the at least one register into the memory unit,wherein, during the idle state, the control unit reads the values of the at least one register stored in the memory unit and writes the reading values of the at least one register into the at least one register when the system voltage is upped to the voltage level greater than the reset low voltage and lower than or equal to the brown-out voltage.

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