beginer help needed

[asifiqbal]

Oh thanks a lot ,too many puzzeles have been solved in my mind with this answer of yours ,i m really feeling like i have jumped from beginner level to 5 steps ahead thanks again, i have an electronics desin of a ups circuit and i am only asking questions related to it ,now the next part of my question is that this pic16f72 generates an AC volt pulse at two of its pins at 50 hrtz , i want to know the command for doing this ,another thing that how can i make two output pins to opposite of one another ,for example if i take porb.0 and portb.1 , if one port is equal to 1 then other should automatically become equal to 0 and vice versa ,

[HenrikOlsson]

Hi,
Oh man, not again.....
What is with this inverter/VFD/UPS stuff, it seems to be a common "beginner project" around here, yet it's NOT (I repeat NOT) a simple project, I don't get it.
Is it possible that this is a school assignment at a certain class/school somewhere and whoever gets assigned the project "this year" always ends up here?

Anyway, as before, there are several ways of making the PIC output a frequency.
Generally speaking using a PIC with a CCP or ECCP or even PCPWM module is the way to go for these sort of things. The PWM feature of the these modules can often, but not always, be configured in half bridge mode. The 16F72 does not have this feature.