Design of an improved watchdog circuit for microcontroller-based systems
M.S. Hefny, Hassanein Hamed Amer · 2000
This paper presents an improved design for a watchdog circuit. Previously, watchdog timers detected refresh inputs that were slower than usual. If a failure causes the microcontroller to produce faster than usual refresh inputs, the watchdog will not detect it. This new design detects failures that produce faster than usual as well as slower than usual refresh inputs. This will greatly improve the reliability of the system protected by this new design.