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msp430f5528 P6口输出电平莫名改变



我在使用P2.0、P2.1定时器输出的pwm波对两路电机进行调速,在pwm波输出正常的情况下,P6.2、P6.3口接电机两端,P2.0输出pwm波对电机进行调速(电机驱动板硬件搭建如此)P6.5、P6.6、P2.1,为第二个电机,一开始P6DIR |= 0xD8; P6OUT |= 0xD8;  CCS在线调试显示输出正常,用万用表直接测I/O口输出电压,该拉低的I/O口还在输出3.5V电压,但是此时CCS上显示还是正常的。。。