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Computer watchdog timer

  • US 6,112,320 A
  • Filed: 10/29/1997
  • Issued: 08/29/2000
  • Est. Priority Date: 10/29/1997
  • Status: Expired due to Fees
First Claim
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1. A watchdog timer for a computer having a central processing unit and a peripheral controller comprising:

  • a. a watchdog program, executing on a micro-code program on said peripheral controller, which periodically interrupts and sends a watchdog check command to said central processing unit of said computer; and

    b. a watchdog interrupt service routine, executing on said central processing unit of said computer, which responds to said interrupt and said watchdog check command with a predefined response;

    wherein said peripheral controller and watchdog program can reset said computer if said predefined response is not received from said watchdog interrupt service routine executing on said central processing unit of said computer.

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