stm32 /stm32h5 /STM32H573 /TIM8 /TIM8_CCMR1_Output

Capture/compare 1 selection This bit-field defines the direction of the channel (input/output) as well as the used input. Note: CC1S bits are writable only when the channel is OFF (CC1E = ‘0’ in TIMx_CCER).

0 (B_0x0): CC1 channel is configured as output

1 (B_0x1): CC1 channel is configured as input, tim_ic1 is mapped on tim_ti1

2 (B_0x2): CC1 channel is configured as input, tim_ic1 is mapped on tim_ti2

3 (B_0x3): CC1 channel is configured as input, tim_ic1 is mapped on tim_trc. This mode is working only if an internal trigger input is selected through TS bit (TIMx_SMCR register)

Output compare 1 fast enable This bit decreases the latency between a trigger event and a transition on the timer output. It must be used in one-pulse mode (OPM bit set in TIMx_CR1 register), to have the output pulse starting as soon as possible after the starting trigger.

0 (B_0x0): CC1 behaves normally depending on counter and CCR1 values even when the trigger is ON. The minimum delay to activate CC1 output when an edge occurs on the trigger input is 5 clock cycles.

1 (B_0x1): An active edge on the trigger input acts like a compare match on CC1 output. Then, OC is set to the compare level independently from the result of the comparison. Delay to sample the trigger input and to activate CC1 output is reduced to 3 clock cycles. OCFE acts only if the channel is configured in PWM1 or PWM2 mode.

Output compare 1 preload enable Note: These bits can not be modified as long as LOCK level 3 has been programmed (LOCK bits in TIMx_BDTR register) and CC1S=‘00’ (the channel is configured in output).

0 (B_0x0): Preload register on TIMx_CCR1 disabled. TIMx_CCR1 can be written at anytime, the new value is taken in account immediately.

1 (B_0x1): Preload register on TIMx_CCR1 enabled. Read/Write operations access the preload register. TIMx_CCR1 preload value is loaded in the active register at each update event.

OC1M[2:0]: Output compare 1 mode These bits define the behavior of the output reference signal tim_oc1ref from which tim_oc1 and tim_oc1n are derived. tim_oc1ref is active high whereas tim_oc1 and tim_oc1n active level depends on CC1P and CC1NP bits. Note: These bits can not be modified as long as LOCK level 3 has been programmed (LOCK bits in TIMx_BDTR register) and CC1S=‘00’ (the channel is configured in output). Note: In PWM mode, the OCREF level changes only when the result of the comparison changes or when the output compare mode switches from ‘frozen’ mode to ‘PWM’ mode. Note: On channels having a complementary output, this bit field is preloaded. If the CCPC bit is set in the TIMx_CR2 register then the OC1M active bits take the new value from the preloaded bits only when a COM event is generated.

0 (B_0x0): Frozen The comparison between the output compare register TIMx_CCR1 and the counter TIMx_CNT has no effect on the outputs.(this mode is used to generate a timing base).

1 (B_0x1): Set channel 1 to active level on match. tim_oc1ref signal is forced high when the counter TIMx_CNT matches the capture/compare register 1 (TIMx_CCR1).

2 (B_0x2): Set channel 1 to inactive level on match. tim_oc1ref signal is forced low when the counter TIMx_CNT matches the capture/compare register 1 (TIMx_CCR1).

3 (B_0x3): Toggle tim_oc1ref toggles when TIMx_CNT=TIMx_CCR1.

4 (B_0x4): Force inactive level tim_oc1ref is forced low.

5 (B_0x5): Force active level tim_oc1ref is forced high.

6 (B_0x6): PWM mode 1 In upcounting, channel 1 is active as long as TIMx_CNT TIMx_CCR1 else inactive. In downcounting, channel 1 is inactive (tim_oc1ref=‘0’) as long as TIMx_CNT TIMx_CCR1 else active (tim_oc1ref=‘1’).

7 (B_0x7): PWM mode 2 In upcounting, channel 1 is inactive as long as TIMx_CNT TIMx_CCR1 else active. In downcounting, channel 1 is active as long as TIMx_CNT TIMx_CCR1 else inactive.

Output compare 1 clear enable

0 (B_0x0): tim_oc1ref is not affected by the tim_ocref_clr_int signal

1 (B_0x1): tim_oc1ref is cleared as soon as a High level is detected on tim_ocref_clr_int signal (tim_ocref_clr input or tim_etrf input)

Capture/compare 2 selection This bit-field defines the direction of the channel (input/output) as well as the used input. Note: CC2S bits are writable only when the channel is OFF (CC2E = ‘0’ in TIMx_CCER).

0 (B_0x0): CC2 channel is configured as output

1 (B_0x1): CC2 channel is configured as input, tim_ic2 is mapped on tim_ti2

2 (B_0x2): CC2 channel is configured as input, tim_ic2 is mapped on tim_ti1

3 (B_0x3): CC2 channel is configured as input, tim_ic2 is mapped on tim_trc. This mode is working only if an internal trigger input is selected through the TS bit (TIMx_SMCR register)

Output compare 2 fast enable

Output compare 2 preload enable

OC2M[2:0]: Output compare 2 mode

Output compare 2 clear enable

OC1M[3]

OC2M[3]