STM32W108HB datasheet(94/179 Pages) STMICROELECTRONICS

94 / 179 page

General-purpose timers

STM32W108CB, STM32W108HB

94/179

Doc ID 16252 Rev 2

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Enable capture from the counter into the capture register by setting the TIM_CC1E bit

in the TIMx_CCER register.

●

If needed, enable the related interrupt request by setting the INT_TIMCC1IF bit in the

INT_TIMxCFG register.

●

When an input capture occurs:

–

The TIMx_CCR1 register gets the value of the counter on the active transition.

–

INT_TIMCC1IF flag is set (capture/compare interrupt flag). The missed

capture/compare flag INT_TIMMISSCC1IF in INT_TIMxMISS is also set if another

capture occurs before the INT_TIMCC1IF flag is cleared.

–

An interrupt may be generated if enabled by the INT_TIMCC1IF bit.

To detect missed captures reliably, read captured data in TIMxCCRy before checking the

missed capture/compare flag. This sequence avoids missing a capture that could happen

after reading the flag and before reading the data.

Note:

Software can generate IC interrupt requests by setting the corresponding TIM_CCyG bit in

the TIMx_EGR register.

8.1.6

PWM input mode

This mode is a particular case of input capture mode. The procedure is the same except:

●

Two ICy signals are mapped on the same TIy input.

●

These two ICy signals are active on edges with opposite polarity.

●

One of the two TIyFP signals is selected as trigger input and the slave mode controller

is configured in reset mode.

For example, to measure the period in the TIMx_CCR1 register and the duty cycle in the

TIMx_CCR2 register of the PWM applied on TI1, use the following procedure depending on

CK_INT frequency and prescaler value:

●

Select the active input for TIMx_CCR1: write the TIM_CC1S bits to 01 in the

TIMx_CCMR1 register (TI1 selected).

●

Select the active polarity for TI1FP1, used both for capture in the TIMx_CCR1 and

counter clear, by writing the TIM_CC1P bit to 0 (active on rising edge).

●

Select the active input for TIMx_CCR2by writing the TIM_CC2S bits to 10 in the

TIMx_CCMR1 register (TI1 selected).

●

Select the active polarity for TI1FP2 (used for capture in the TIMx_CCR2) by writing the

TIM_CC2P bit to 1 (active on falling edge).

●

Select the valid trigger input by writing the TIM_TS bits to 101 in the TIMx_SMCR

●

Configure the slave mode controller in reset mode by writing the TIM_SMS bits to 100

in the TIMx_SMCR register.

●

Enable the captures by writing the TIM_CC1E and TIM_CC2E bits to 1 in the

TIMx_CCER register.

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