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Microcomputer

  • US 20060206746A1
  • Filed: 02/21/2006
  • Published: 09/14/2006
  • Est. Priority Date: 03/08/2005
  • Status: Active Grant
First Claim
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1. A microcomputer, comprising:

  • a central processing unit;

    a program memory for storing a control program executed by the central processing unit;

    a plurality of peripheral circuits for implementing a predetermined function;

    a clock control circuit for controlling a clock signal provided to the central processing unit and the peripheral circuits; and

    a voltage drop detection circuit for detecting a drop in a voltage of a power supply below a predetermined level, the voltage drop detection circuit being disposed at an end portion of a power line, wherein the program memory further stores a subroutine program for causing the central processing unit to execute a clock control process, when the voltage drop detection circuit detects the drop in the voltage below the predetermined level, a frequency of the clock signal provided through the clock control circuit to the central processing unit is divided down and the subroutine program is executed by the central processing unit, and the central processing unit, operating in accordance with the subroutine program, selectively stop or divides down the clock signal provided to the peripheral circuits.

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