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Method and circuit for safeguarding CMOS RAM data in a computer system at low battery power

  • US 6,266,786 B1
  • Filed: 11/25/1998
  • Issued: 07/24/2001
  • Est. Priority Date: 08/04/1998
  • Status: Expired due to Term
First Claim
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1. A method for use on a computer system with a CMOS RAM unit powered by a battery unit to safeguard the CMOS RAM data when the battery power from the battery unit is below working level, comprising the steps of:

  • (1) in power-off state, detecting whether the current power level of the battery unit is below working level;

    if yes, performing the substeps of;

    (1-1) turning on the main power of the computer system;

    (1-2) moving the data currently stored in the CMOS RAM unit to a backup-data storage unit; and

    (1-3) turning off the main power of the computer system;

    (2) at the next time the computer system is powered on, moving the data currently stored in the backup-data storage unit back to the CMOS RAM unit; and

    (3) displaying a message requesting the user to replace the battery unit with a new one.

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