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LPC29xx Microcontrollers Slide 30
The first part of the image illustrates the operation of PWM0 in continuous mode. The rising and falling edges of PWM0 are controlled by the 16-bit counter and match the active and deactive registers. The match active register defines the position of the rising edge while the MTCHDEACT register defines the falling edge of the waveform. The PWM output changes when the 16-bit counter matches the values defined in the related registers. The SYNC_IN input of each PWM timer is used to reset (resynchronize) the PWM block. The SYNC_OUT can be asserted immediately after the SYNC_IN or can be delayed via the SYNDEL register. In the second part of the image, PWM0 is synchronized with PWM1. Each time a sync event is provided to PWM0, PWM1 starts or restarts after the sync delay programmed in the SYNDEL register. The image on this slide illustrates the Timer 1 carrier signal with a 50% duty cycle modulated with the internal PWM. The modulated signal typically has a higher frequency.
PTM Published on: 2011-11-02