(1) TIM_Perscaler is used to set the pre-scaling factor;
(2) TIM_ClockDivision to set the clock division (clock division factor);
(3) TIM_CounterMode to set the counter mode;
Clock division defines the division ratio between the timer clock frequency (CK_INT) and the sampling frequency used by the digital filter (ETR,TIx). The parameters of TIM_ClockDivision are as follows:
TIM_ClockDivision | describe | Binary Value |
TIM_CKD_DIV1 | tDTS = Tck_tim | 0x00 |
TIM_CKD_DIV2 | tDTS = 2 * Tck_tim | 0x01 |
TIM_CKD_DIV4 | tDTS = 4 * Tck_tim | 0x10 |
The digital filter (ETR, TIx) is used to filter the divided signal coming from ETR to ensure that the frequency of the signal passing through does not exceed a certain limit.
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