STM32W108CB datasheet(205/278 Pages) STMICROELECTRONICS

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STM32W108HB STM32W108CC STM32W108CB STM32W108CZ

General-purpose timers

Doc ID 16252 Rev 14

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10.3.9

Timer x capture/compare mode register 2 (TIMx_CCMR2)

Address offset: 0xE01C (TIM1) and 0xF01C (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

OC4M[2:0]

OC4PE

OC4FE

CC4S[1:0]

Reserved

OC3M[2:0]

OC3PE

OC3FE

CC3S[1:0]

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

Bits [14:12] OC4M[2:0]: Output Compare 4 Mode

Define the behavior of the output reference signal OC4REF from which OC4 derives.

OC4REF is active high whereas OC4’s active level depends on the CC4P bit.

000: Frozen - The comparison between the output compare register TIMx_CCR4 and the

counter TIMx_CNT has no effect on the outputs.

001: Set OC4REF to active on match. The OC4REF signal is forced high when the counter

TIMx_CNT matches the capture/compare register 4 (TIMx_CCR4).

010: Set OC4REF to inactive on match. OC4REF signal is forced low when the counter

TIMx_CNT matches the capture/compare register 4 (TIMx_CCR4).

011: Toggle - OC4REF toggles when TIMx_CNT = TIMx_CCR4

100: Force OC4REF inactive

101: Force OC4REF active

110: PWM mode 1 - In up-counting, OC4REF is active as long as TIMx_CNT < TIMx_CCR4,

otherwise OC4REF is inactive. In down-counting, OC4REF is inactive if

TIMx_CNT > TIMx_CCR4, otherwise OC4REF is active.

111: PWM mode 2 - In up-counting, OC4REF is inactive if TIMx_CNT < TIMx_CCR4,

otherwise OC4REF is active. In down-counting, OC4REF is active if

TIMx_CNT > TIMx_CCR4, otherwise it is inactive.

Note: In PWM mode 1 or 2, the OC4REF 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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