答：大多数都有看门狗定时器功能（wdt，watch dog timer）以避免程序跑错。holtek有一款基本i/o型--ht48r05a-1，我们就以它为例做个说明吧。
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像大多数万分之一，它有多个定时器，在这种情况下6，与另两个16位的定时器专用于看门狗功能。
Like most micros, it has multiple timers, in this case six, with another two 16-bit timers dedicated to watchdog functionality.
另一个有趣的MCU具有独特的看门狗功能是STM 32f100系列意法半导体万分之一，其中有两个看门狗定时器。
Another interesting MCU with unique watchdog functionality is the STM32F100 family of micros from STMicroelectronics, which have two watchdog timers.
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