Forced Output Mode; Figure 164. Pwm Input Mode Timing - STMicroelectronics RM0365 Reference Manual

Advanced-control timers (TIM1)
For example, the user can measure the period (in TIMx_CCR1 register) and the duty cycle
(in TIMx_CCR2 register) of the PWM applied on TI1 using the following procedure
(depending on CK_INT frequency and prescaler value):
•
Select the active input for TIMx_CCR1: write the CC1S bits to 01 in the TIMx_CCMR1
register (TI1 selected).
•
Select the active polarity for TI1FP1 (used both for capture in TIMx_CCR1 and counter
clear): write the CC1P and CC1NP bits to '0' (active on rising edge).
•
Select the active input for TIMx_CCR2: write the CC2S bits to 10 in the TIMx_CCMR1
register (TI1 selected).
•
Select the active polarity for TI1FP2 (used for capture in TIMx_CCR2): write the CC2P
and CC2NP bits to CC2P/CC2NP='10' (active on falling edge).
•
Select the valid trigger input: write the TS bits to 101 in the TIMx_SMCR register
(TI1FP1 selected).
• Configure the slave mode controller in reset mode: write the SMS bits to 0100 in the
TIMx_SMCR register.
•
Enable the captures: write the CC1E and CC2E bits to '1' in the TIMx_CCER register.
20.3.9

Forced output mode

In output mode (CCxS bits = 00 in the TIMx_CCMRx register), each output compare signal
(OCxREF and then OCx/OCxN) can be forced to active or inactive level directly by software,
independently of any comparison between the output compare register and the counter.
To force an output compare signal (OCXREF/OCx) to its active level, user just needs to
write 0101 in the OCxM bits in the corresponding TIMx_CCMRx register. Thus OCXREF is
forced high (OCxREF is always active high) and OCx get opposite value to CCxP polarity
bit.
For example: CCxP=0 (OCx active high) => OCx is forced to high level.
The OCxREF signal can be forced low by writing the OCxM bits to 0100 in the
TIMx_CCMRx register.
483/1080

Figure 164. PWM input mode timing

DocID025202 Rev 7
RM0365