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CC2541在打开低功耗模式时Timer3计数器溢出周期变了

Other Parts Discussed in Thread: CC2541

基于BLE-CC254x-1.4.0协议栈开发,给CC2541的P0_0送入模拟心电信号进行AD转换,通过TIMER3实现250sps采样率进行采集该信号,如果不打开POWER_SAVING,则没有问题,每次Timer3溢出中断都是4ms(250sps)一次,但打开POWER_SAVING后,Timer3溢出中断的周期为60ms,请TI专家帮忙看看什么原因?

图一:打开低功耗TIMER3溢出周期(高电平20ms,低电平40ms)

图二:关闭低功耗TIMER3溢出周期(高低电平都是4ms)