STM32W108CB datasheet(122/179 Pages) STMICROELECTRONICS

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General-purpose timers

STM32W108CB, STM32W108HB

122/179

Doc ID 16252 Rev 2

[15:12] TIM_IC4F: Input Capture 1 Filter. (Applies only if TIM_CC4S > 0)

This defines the frequency used to sample the TI4 input, Fsampling, and the length of the

digital filter applied to TI4. The digital filter requires N consecutive samples in the same state

before being output.

0000: Fsampling=PCLK, no filtering.1000: Fsampling=PCLK/8, N=6.

0001: Fsampling=PCLK, N=2.1001: Fsampling=PCLK/8, N=8.

0010: Fsampling=PCLK, N=4.1010: Fsampling=PCLK/16, N=5.

0011: Fsampling=PCLK, N=8.1011: Fsampling=PCLK/16, N=6.

0100: Fsampling=PCLK/2, N=6.1100: Fsampling=PCLK/16, N=8.

0101: Fsampling=PCLK/2, N=8.1101: Fsampling=PCLK/32, N=5.

0110: Fsampling=PCLK/4, N=6.1110: Fsampling=PCLK/32, N=6.

0111: Fsampling=PCLK/4, N=8.1111: Fsampling=PCLK/32, N=8.

Note: PCLK is 12 MHz when using the 24 MHz crystal oscillator, and 6 MHz using the 12 MHz

RC oscillator.

[11:10] TIM_IC4PSC: Input Capture 1 Prescaler. (Applies only if TIM_CC4S > 0)

00: No prescaling, capture each time an edge is detected on the capture input.

01: Capture once every 2 events.

10: Capture once every 4 events.

11: Capture once every 6 events.

[9:8] TIM_CC4S: Capture / Compare 1 Selection

This configures the channel as an output or an input. If an input, it selects the input source.

00: Channel is an output.

01: Channel is an input and is mapped to TI4.

10: Channel is an input and is mapped to TI3.

11: Channel is an input and is mapped to TRGI. This mode requires an internal trigger input

selected by the TIM_TS bit in the TIMx_SMCR register.

Note: TIM_CC2S may be written only when the channel is off (TIM_CC2E = 0 in the

TIMx_CCER register).

[6:4] TIM_OC3M: Output Compare 1 Mode. (Applies only if TIM_CC3S = 0)

See TIM_OC4M description above.

[3] TIM_OC3BE: Output Compare 3 Buffer Enable. (Applies only if TIM_CC3S = 0)

See TIM_OC4BE description above.

[2] TIM_OC3FE: Output Compare 3 Fast Enable. (Applies only if TIM_CC3S = 0)

See TIM_OC4FE description above.

[7:4] TIM_IC3F: Input Capture 1 Filter. (Applies only if TIM_CC3S > 0)

See TIM_IC4F description above.

[3:2] TIM_IC3PSC: Input Capture 1 Prescaler. (Applies only if TIM_CC3S > 0)

See TIM_IC4PSC description above.

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