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Enhanced Capture (eCAP) Module
Example 15-14. Code Snippet for Multichannel PWM Generation with Synchronization
// Code snippet for APWM mode Example 2
// Run Time (Note: Example execution of one run-time instant)
//============================================================
ECAP1Regs.CAP2 = 7000; // Set Duty cycle i.e., compare value = 7000
ECAP2Regs.CAP2 = 2000; // Set Duty cycle i.e., compare value = 2000
ECAP3Regs.CAP2 = 550; // Set Duty cycle i.e., compare value = 550
ECAP4Regs.CAP2 = 6500; // Set Duty cycle i.e., compare value = 6500
15.3.3.5.3 Multichannel PWM Generation with Phase Control Example
In Figure 15-115, the Phase control feature of the APWM mode is used to control a 3 phase Interleaved
DC/DC converter topology. This topology requires each phase to be off-set by 120° from each other.
Hence if “Leg” 1 (controlled by APWM1) is the reference Leg (or phase), that is, 0°, then Leg 2 need 120°
off-set and Leg 3 needs 240° off-set. The waveforms in Figure 15-115 show the timing relationship
between each of the phases (Legs). Note eCAP1 module is the Master and issues a sync out pulse to the
slaves (modules 2, 3) whenever TSCTR = Period value.
1631
SPRUH73H–October 2011–Revised April 2013 Pulse-Width Modulation Subsystem (PWMSS)
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