Method and apparatus for insuring operation of a multiple...

Details Method and apparatus for insuring operation of a multiple... Method and apparatus for insuring operation of a multiple...

G - Physics

06

F

354/230.82

G06F 9/445 (2006.01) G06F 1/24 (2006.01) G06F 11/00 (2006.01) G06F 11/14 (2006.01)

Patent

CA 1316270

Title METHOD AND APPARATUS FOR INSURING OPERATION OF A MULTIPLE PART SYSTEM CONTROLLER Inventor John L. Hartman Abstract In a system controller having multiple parts including a microprocessor, a main program for execution upon the microprocessor, and at least one clock interrupt handler portion, a method and apparatus for insuring proper operation comprised of providing a main counter and a delay counter in the main program providing a hardware watchdog timer, and providing in the clock interrupt handler means for starting the hardware watchdog timer and decrementing the main counter of the main program. The hardware watchdog timer reinitializes the main program in the event that the main program fails to respond to the clock interrupt handler and the delay counter reinitializes the main program and the clock interrupt handler in the event that the watchdog timer fails to operate. Therefore, each of the multiple parts of the system controller serve to insure the functionality of the other parts.

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