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使用430捕获脉宽

Other Parts Discussed in Thread: MSP430G2553

我在使用msp430g2553的time_A0的连续模式下,我把TACCTL0做为捕获模式用,捕获一个矩形波的上升沿并读取中断时TAR的值,读不到正确的值,我又换了读TACCR0中的值,也读不出来,我参考一些其他类型的430关于这方面的程序,都差不多,为什么我的不行呢,求解?