AN4013 datasheet(18/37 Pages) STMICROELECTRONICS

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General-purpose timer modes

AN4013

18/37

DocID022500 Rev 4

STM32Cube F3 firmware package includes examples in the following directories:



Projects\STM32F3-Discovery\Examples\TIM\TIM_Asymetric,



Projects\STM32303E_EVAL\Examples\TIM\TIM_Asymetric



Projects\STM32303C_EVAL\Examples\TIM\TIM_Asymetric.

2.8

Timer combined PWM mode available for

STM32F30x and STM32F3x8 lines

The combined mode allows generating edge or center aligned PWM signals with

programmable delay and phase shift between respective pulses. To generate a combined

signal, the TIMx_CCRx and TIMx_CCRy must be used to program the delay and the phase

shift, the frequency is determined by the value of the TIMx_ARR register. The resulting

signal (combined signal) is made of an OR or AND logical combination of two reference

PWMs. So the combined PWM mode can be selected independently on two channels by

programming the OCxM bits in TIMx_CCMRx register:



OCxM = 1100 to use the Combined PWM1, in this case the combined output reference

has the same behavior as in PWM mode 1. The combined output reference is the

logical OR between OC1/3REF and OC2/4REF



OCxM = 1101 to use the Combined PWM2,in this case the combined output reference

has the same behavior as in PWM mode 2. The combined output reference is the

logical AND between OC1/2REF and OC2/4REF

The following figures resume the combined mode

Figure 2. Combined PWM mode

AN4013 Datasheet(PDF) 18 Page - STMicroelectronics