> Is it possible to drive more than one PWM output at different duty
cycles
> from the one PWM output pin (CCP1) on the PIC16F877 ?

Of course not!  How do you expect to get two PWM output streams from one
pin!!?

> This would be to
> control two Peltier devices from the one PIC.

By the way, Peltier devices are badly suited to be driven via PWM.  Their
inefficiency goes up with the drive level, so you want to use the lowest
drive level possible, which means continuous operation.  In other words,
continuous 50% is more efficient than half full on and half off.  You can
still use PWM from the PIC to control this, but it should be filtered so
that the Peltier device sees a reasonably constant level.


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