While doing programming to use different registers,bank changing is necessary. Suppose to use a register i moved to bank 1 program and can i continue programming from bank1 till the changeover is necessary or i have to goback to bank o all the time to continue the programming.
As long as all the registers you're accessing at that point are in bank 1, you don't need to switch back to bank 0. Bank changing is necessary when you'll access a register which is not in the same bank as the one you're in.