RM0385 Datasheet, PDF (636/1644 Pages) STMicroelectronics – This reference manual targets application developers

Advanced-control timers (TIM1/TIM8)
RM0385
22.3.12
Note:
Asymmetric PWM mode
Asymmetric mode allows two center-aligned PWM signals to be generated with a
programmable phase shift. While the frequency is determined by the value of the
TIMx_ARR register, the duty cycle and the phase-shift are determined by a pair of
TIMx_CCRx register. One register controls the PWM during up-counting, the second during
down counting, so that PWM is adjusted every half PWM cycle:
– OC1REFC (or OC2REFC) is controlled by TIMx_CCR1 and TIMx_CCR2
– OC3REFC (or OC4REFC) is controlled by TIMx_CCR3 and TIMx_CCR4
Asymmetric PWM mode can be selected independently on two channel (one OCx output
per pair of CCR registers) by writing ‘1110’ (Asymmetric PWM mode 1) or ‘1111’
(Asymmetric PWM mode 2) in the OCxM bits in the TIMx_CCMRx register.
The OCxM[3:0] bit field is split into two parts for compatibility reasons, the most significant
bit is not contiguous with the 3 least significant ones.
When a given channel is used as asymmetric PWM channel, its complementary channel
can also be used. For instance, if an OC1REFC signal is generated on channel 1
(Asymmetric PWM mode 1), it is possible to output either the OC2REF signal on channel 2,
or an OC2REFC signal resulting from asymmetric PWM mode 1.
Figure 169 represents an example of signals that can be generated using Asymmetric PWM
mode (channels 1 to 4 are configured in Asymmetric PWM mode 1). Together with the
deadtime generator, this allows a full-bridge phase-shifted DC to DC converter to be
controlled.
Figure 169. Generation of 2 phase-shifted PWM signals with 50% duty cycle
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2&5()&
&&5 
&&5  _2&5()&
&&5 
&&5 
069
22.3.13
Combined PWM mode
Combined PWM mode allows two edge or center-aligned PWM signals to be generated with
programmable delay and phase shift between respective pulses. While the frequency is
determined by the value of the TIMx_ARR register, the duty cycle and delay are determined
by the two TIMx_CCRx registers. The resulting signals, OCxREFC, are made of an OR or
AND logical combination of two reference PWMs:
– OC1REFC (or OC2REFC) is controlled by TIMx_CCR1 and TIMx_CCR2
– OC3REFC (or OC4REFC) is controlled by TIMx_CCR3 and TIMx_CCR4
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