One-Pulse Mode; Figure 164. Edge-Aligned Pwm Waveforms (Arr=8); Figure 165. Example Of One Pulse Mode - ST STM32F101 series Reference Manual

General-purpose timers (TIM9 to TIM14)
16.3.10

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)
433/1128

Figure 164. Edge-aligned PWM waveforms (ARR=8)

Counter register
OCXREF
CCRx=4
CCxIF
OCXREF
CCRx=8
CCxIF
OCXREF
CCRx>8
CCxIF
OCXREF
CCRx=0
CCxIF

Figure 165. Example of one pulse mode.

TI2
OC1REF
OC1
TIM1_ARR
TIM1_CCR1
0
t
DELAY
DocID13902 Rev 15
0 1 2 3 4 5
t
PULSE
RM0008
6 7 8 0 1
t