![]() ![]() The MCU checks in with the watchdog timer at a set interval to show that it’s still on the job. Watchdog timers (WDTs), or watchdogs, are circuits external to the processor that can detect and trigger a processor reset (and/or another event) if necessary. ![]() (The BSoD happens much less often these days.) Embedded systems are different from desktop computers, however, in that there is rarely going to be a human around who will know how to reboot the failing device. In “the old days,” the Windows operating system would occasionally crash (experience a fatal error) and put up what was called the Blue Screen of Death (BSoD) where after it would reboot to prevent damage to the computer such as writing over vital boot code or similarly dangerous events. If a program goes haywire or into an infinite loop, it needs a way to check and see if things are still running. In the world of microcontrollers (MCUs), sometimes things go wrong. ![]()
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