使用FR5738的过程中，用timeB定时器定时250ms，但实际的定时间是700ms左右。时钟源选择的是ACLK，定时器初始化函数如下：
TBCTL = TBSSEL_1 + MC_1 + TBCLR;
TBCCR0 = 8192 ;
TBCCTL0 |= CCIE ;
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