PWM Duty cycle

HI Sarathi,

If you are using HALCoGen, the APIs pwmSetSignal() and pwmSetDuty() can be used to change the duty cycle during runtime.

Thanks and Regards,
Vineeth

Normally, a PWM is generated by two instructions. The following two example will generate a 50% duty cycle pwm on pin 0.

CN1 CNT { reg=A, max=50 }
EA ECMP { hr_lr=HIGH, en_pin_action=ON, pin=0,
action=PULSELO, reg=A, data=25, hr_data=0 }

To modify the duty cycle at runtime, you can use CPU to write a new value to the data field of the ECMP instruction. You will need to take follwoing steps.

(1) read the NHET section of the TRM to understand how it works.
(2) find the instruction in the Halcogen generated NHET code for generating PWM.

Thanks and regards,

Zhaohong