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看门狗喂狗前的操作

Other Parts Discussed in Thread: MSP430G2553, MSP430F5418A

请教一下,看门狗喂狗的时候需不需要先执行这个操作 WDTCTL = WDTPW + WDTHOLD; 然后再喂狗呢?   看有关资料上说对WDT相关寄存器操作前最好先执行此操作!!!我用的是MSP430F5418A和MSP430G2553两种MCU。