AN4013 datasheet(14/37 Pages) STMICROELECTRONICS

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General-purpose timer modes

AN4013

14/37

DocID022500 Rev 4

To configure the timer in one of these modes:

Select the clock source.

Write the desired data in the ARR and CCRx registers.

Configure the output mode:

Select the output compare mode: timing / active / inactive / toggle.

In case of active, inactive and toggle modes, select the polarity by writing CCxP in

CCER register.

Disable the preload feature for CCx by writing OCxPE in CCMRx register.

Enable the capture / compare output by writing CCxE in CCMRx register.

Enable the counter by setting the CEN bit in the TIMx_CR1 register.

Set the CCxIE / CCxDE bit if an interrupt / DMA request is to be generated.

Timer output compare timing / toggle update rate computation

CCx update rate = TIMx_Counter_CLK / CCRx



If internal clock: TIMx_Counter_CLK = TIM_CLK / (PSC + 1)



If external clock mode2: TIMx_Counter_CLK = ETR_CLK / ((ETR_PSC)*(PSC + 1))



If external clock mode1: TIMx_Counter_CLK = TIx_CLK/(PSC + 1)

–

if ETRF used as clock source: TRGI_CLK = ETR_CLK / ETR_PSC

–

if TI1FP1 used as clock source: TRGI_CLK = TI1_CLK / TI1_PSC

–

if TI2FP2 used as clock source: TRGI_CLK = TI2_CLK / TI2_PSC

–

if TI1_ED used as clock source: TRGI_CLK = TI1_ED_CLK

–

if ITRx used as clock source: TRGI_CLK = ITRx_CLK

Timer output compare active/inactive delay computation

CCx_delay = CCRx /TIMx_Counter_CLK



If internal clock: TIMx_Counter_CLK = TIM_CLK / (PSC + 1)



If external clock mode2: TIMx_Counter_CLK = ETR_CLK / ((ETR_PSC)*(PSC + 1))



If external clock mode1: TIMx_Counter_CLK = TIx_CLK/(PSC + 1)

–

if ETRF used as clock source: TRGI_CLK = ETR_CLK / ETR_PSC

–

if TI1FP1 used as clock source: TRGI_CLK = TI1_CLK / TI1_PSC

–

if TI2FP2 used as clock source: TRGI_CLK = TI2_CLK / TI2_PSC

–

if TI1_ED used as clock source: TRGI_CLK = TI1_ED_CLK

–

if ITRx used as clock source: TRGI_CLK = ITRx_CLK

For more details on using the timer in this mode, refer to the examples provided in the

STM32xx standard peripheral libraries, in the /Project/STM32xx_StdPeriph_Examples/

TIM/OC_Toggle, /OCActive and /OCInactive folders.

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