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关于定时器触发AD10的触发周期问题



我想问一下,我用的是msp430F74单片机,

TACCTL1 = OUTMOD_4; // Toggle on EQU1 (TAR = 0)

TACTL = TASSEL_2 + MC_2; // SMCLK, cont-mode     这两句话是用Timer_A.OUT1来触发AD采集,这个控制触发的周期是多少呢?假如说我的SMCLK是500Khz,十分感谢