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MSP430G2553 P1.4口无法输出高电平

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在Proteus仿真中,同时使P1和P2一共16个I/O口输出,P1.4始终无法输出高电平!

#include "msp430G2553.h"
void main( )
{
WDTCTL = WDTPW + WDTHOLD;
P1DIR=0xff;
P2DIR=0xff;
while(1)
{ P1OUT=0XFF;P2OUT=0xFF;} 
}


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