过程如下：
下载完程序后，上电程序正常运行，外置看门狗高电平，由于一些别的原因程序会死循环，看门狗地低电平，RST复位重启，程序正常运行；这几天调试芯片都能正常重启
今天下午调试的，突然发现程序死掉，外置看门狗给低电平芯片RST不能复位重新启动了；重新下载程序后，RST复位功能又恢复正常了
问：为什么RST失效了呢
看门狗外置，示波器看了给的复位电平也正常；
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