msp430fr2311进入LPM3，TB0 设为定时timer（aclk时钟源），TB1设置为PWM（smclk时钟源），为何TB1不同频率会影响定时timer周期？
注： 在中断内触发PWM， 不同smclk对 指令周期确实有一定影响，设置tb1 8M smclk 比1M 时tb0 timer 周期缩短了10%
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