Hi,
Looking at the datasheet for the 16F877 for example it shows that all the port registers are concecuitive in memory. So I think it'll work to just do something like
Code:
FOR i = 0 to 34 35 bits (depending on how wide PortE is)
TOGGLE PORTA.0[i]
NEXT
Just be careful so you don't write beyond the port registers and obviosuly there will be a "gap" at bits 6 and 7 of port A.
Never tried it myself.

/Henrik.