powerpc8377看门狗

If the software watchdog timer is not needed, the user must clear SWCRR[SWEN] bit

the WDT not later than its timer times out (~12.8 sec. for a 333-MHz system clock).

看门狗经过16位分频即f=333Mhz/65536

时间周期为t=1/f

定时时间为65536*t=12.8s

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