One-Pulse Mode; Figure 199. Edge-Aligned Pwm Waveforms (Arr=8) - ST STM32F423 Reference Manual

RM0430
19.3.10

One-pulse mode

One-pulse mode (OPM) is a particular case of the previous modes. It allows the counter to
be started in response to a stimulus and to generate a pulse with a programmable length
after a programmable delay.
Starting the counter can be controlled through the slave mode controller. Generating the
waveform can be done in output compare mode or PWM mode. You select One-pulse mode
by setting the OPM bit in the TIMx_CR1 register. This makes the counter stop automatically
at the next update event UEV.
A pulse can be correctly generated only if the compare value is different from the counter
initial value. Before starting (when the timer is waiting for the trigger), the configuration must
be as follows:
CNT < CCRx ≤ ARR (in particular, 0 < CCRx)

Figure 199. Edge-aligned PWM waveforms (ARR=8)

RM0430 Rev 8
General-purpose timers (TIM9 to TIM14)
611/1324
641