Hi Deeps/ Sakki,
You can use two PWM components with suitable clocks and so that the required Frequency and Duty Cycle is obtained.
The following is to be done:
1) PWM_1 output is to be stopped when the input supply voltage goes below 3V. Hence, use a resistor divider bias (2 equal resistors in series) to divide the voltage by two. Use VDAC8_1 of 1.5V connected to the inverting input terminal of the comparator, Comp_1.
2) Use another comparator, Comp_2 to which VDAC8_2 is connected with voltage set to 2V.
3) When voltage goes below 2V, then isr_1 will be triggered. In the ISR, change the Compare value of PWM_2 such that the duty cycle reduces.
4) When the voltage reduces below 1.5V, PWM_1 output will reset and hence go low.
The snap-shot of the schematic is attached in the next post.
