Specifications

dsPIC33F/PIC24H Family Reference Manual

Example 43-18: Independent PWM ADC Triggering

Note 1: The TRGSTAT bit is cleared only by clearing the TRGIEN bit (PWMCONx<10>). It

is not cleared automatically.

2: Dynamic triggering can show some advantages where multiple PWM channels are

used in applications such as IPFC and multi-phase buck regulators. TRIGx values

can be changed based on the PWM period, duty, load current, etc. This is to ensure

that the trigger points are separated from the PWM channel’s rise and fall

instances.

/* Independent PWM ADC triggering */

TRIG1 = 1248; /* Point at which the ADC module is to be

triggered by primary PWM */

STRIG1 = 2496; /* Point at which the ADC module is to be

triggered by secondary PWM */

TRGCON1bits.TRGDIV = 0; /* Trigger output divider set to trigger

ADC on every trigger match event */

TRGCON1bits.DTM = 1; /* Primary and Secondary triggers combined

to create ADC trigger */

TRGCON1bits.TRGSTRT = 4; /* First ADC trigger event occurs after

four trigger match events */

PWMCON1bits.TRGIEN = 1; /* Trigger event generates an interrupt

request */

while (PWMCON1bits.TRGSTAT = = 1);/* Wait for PWM trigger interrupt status

change */