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为什么实现不了先亮后灭的效果，而且P1OUT=0;P4OUT=0;这两个语句顺序不同，效果也不一样。

user6029870
Prodigy 10 points


WDTCTL = WDTPW + WDTHOLD;
P1DIR|=BIT0;
P4DIR|=BIT7;
P1OUT=0;
P4OUT=0;

delay_nms(50000);
P4OUT=1;
P1OUT=1;