STM32W108CB datasheet(203/278 Pages) STMICROELECTRONICS

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STM32W108HB STM32W108CC STM32W108CB STM32W108CZ

General-purpose timers

Doc ID 16252 Rev 14

203/278

Input capture mode

Reserved

IC2F[3:0]

IC2PSC[1:0]

CC2S[1:0]

IC1F[3:0]

IC1PSC[1:0]

CC1S[1:0]

Bits [31:16] Reserved, must be kept at reset value

Bits [15:12] IC2F[3:0]: Input Capture 1 Filter

This defines the frequency used to sample the TI2 input, Fsampling, and the length of the

digital filter applied to TI2. The digital filter requires N consecutive samples in the same state

before being output.

0000: Fsampling=PCLK, no filtering

0001: Fsampling=PCLK, N=2

0010: Fsampling=PCLK, N=4

0011: Fsampling=PCLK, N=8

0100: Fsampling=PCLK/2, N=6

0101: Fsampling=PCLK/2, N=8

0110: Fsampling=PCLK/4, N=6

0111: Fsampling=PCLK/4, N=8

1000: Fsampling=PCLK/8, N=6

1001: Fsampling=PCLK/8, N=8

1010: Fsampling=PCLK/16, N=5

1011: Fsampling=PCLK/16, N=6

1100: Fsampling=PCLK/16, N=8

1101: Fsampling=PCLK/32, N=5

1110: Fsampling=PCLK/32, N=6

1111: Fsampling=PCLK/32, N=8

Note: PCLK is 12 MHz when using the 24 MHz HSE OSC, and 6 MHz using the

12 MHz HSI RC oscillator.

Bits [11:10] IC2PSC[1:0]: Input Capture 1 Prescaler

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

Bits [9:8] CC2S[1:0]: 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 TI2

10: Channel is an input and is mapped to TI1

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

selected by the TS bit in the TIMx_SMCR register.

Note: CC2S may be written only when the channel is off (CC2E = 0 in the TIMx_CCER

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