One-Pulse Mode; Figure 183. Edge-Aligned Pwm Waveforms (Arr=8); Figure 184. Example Of One Pulse Mode - ST STM32F40 Series Reference Manual

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General-purpose timers (TIM9 to TIM14)

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)

Counter register

Doc ID 018909 Rev 4

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