Introduction to Digital Power Conversion
XMC4000/1000 Family
PWM Generation
Application Guide 26 V1.0, 2015-01
PWM Duty-Cycle Control by Period Register
PWM modulation (with fixed cycle period target option) is achieved by adding a ∆PR-value and
respectively substracting the same ∆PR-value to the period registers of the PWM channel single-shot
timer pair. Updates are via period shadow registers, by compare-ISR, and are set on shadow
transfers.
Figure 15 PWM – Dual Channel / Complementary Outputs w/ Individual Deadtime
PWM Phase-Shift Control by External Start of Single-Shot Timer Pairs
The coherent update mechanism via shadow transfers can be used to control a certain Phase-Shift
magnitude between the two slice-pairs, in this instance CC40/41 and CC42/43 respectively.
A good example, using just a CCU4 in this concept, is Fixed Phase-Shift Control with Zero-Voltage
Switching (ZVS) (See Figure 27).
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