Sine wave power inverter

[sougata]

I have found that 16f72 has only FSR(at addr. 04,84,104&184h).from the datasheet,could that be the reason for the errors?..

Seems so

implementing this seems a tedious task for me as a beginner in basic and i need further help.

This forum is the best place for PBP+PIC

Can't the anded schematics attached to my last post do the steering?

Yes, I only suggested another option.

From what i understand by using four ports with buffers to steer the PWM would mean configuring the four ports as input permanently, is it?

Not really. Having the ability to use the Hardware PWM and general I/O (for experimenting with softpwm, perhaps) without changing your circuit can be beneficial during development

I will appriciate the compile portion so that i can use scope to verify the PWM outputs.

Hope I find some time for it.