STM32W108HB datasheet(201/278 Pages) STMICROELECTRONICS

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STM32W108HB STM32W108CC STM32W108CB STM32W108CZ

General-purpose timers

Doc ID 16252 Rev 14

201/278

10.3.8

Timer x capture/compare mode register 1 (TIMx_CCMR1)

Address offset: 0xE018 (TIM1) and 0xF018 (TIM2)

Reset value:

0x0000 0000

The timer channels can be programmed as inputs (capture mode) or outputs (compare

mode). The direction of a channel “y” is defined by configuring the corresponding CCyS bits

in this register. All other bits have different functions in input and in output mode. For a given

bit:

●

OCxy describes its function when the channel is configured as an output (CCyS = 0)

●

ICxy describes its function when the channel is configured as an input (CCyS > 0)

In short, the same bit can have a different meaning for the input stage and for the output

stage. Care should be taken.

Output compare mode

Reserved

OC2M[2:0]

OC2PE

OC2FE

CC2S[1:0]

Reserved

OC1M[2:0]

OC1PE

OC1FE

CC1S[1:0]

Bits [31:15] Reserved, must be kept at reset value

Bits [14:12] OC2M[2:0]: Output Compare 2 Mode

Defines the behavior of the output reference signal OC2REF from which OC2 derives.

OC2REF is active high whereas OC2''s active level depends on the CC2P bit.

000: Frozen - The comparison between the output compare register TIMx_CCR2 and the

counter TIMx_CNT has no effect on the outputs.

001: Set OC2REF to active on match. The OC2REF signal is forced high when the counter

TIMx_CNT matches the capture/compare register 2 (TIMx_CCR2).

010: Set OC2REF to inactive on match. OC2REF signal is forced low when the counter

TIMx_CNT matches the capture/compare register 2 (TIMx_CCR2).

011: Toggle - OC2REF toggles when TIMx_CNT = TIMx_CCR2

100: Force OC2REF inactive

101: Force OC2REF active

110: PWM mode 1 - In up-counting, OC2REF is active as long as TIMx_CNT < TIMx_CCR2,

otherwise OC2REF is inactive. In down-counting, OC2REF is inactive if

TIMx_CNT > TIMx_CCR2, otherwise OC2REF is active.

111: PWM mode 2 - In up-counting, OC2REF is inactive if TIMx_CNT < TIMx_CCR2,

otherwise OC2REF is active. In down-counting, OC2REF is active if

TIMx_CNT > TIMx_CCR2, otherwise it is inactive.

Note: In PWM mode 1 or 2, the OC2REF level changes only when the result of the

comparison changes or when the output compare mode switches from “frozen” mode to

“PWM” mode.

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