My problem is fairly simple, but I need some help implementing it. I have 3 switches connected to P2 that put my device into 3 different modes. I have a main routine that initially checks the switches, sets initial conditions to some registers, and calls the appropriate sub-routine.

While I'm within that sub-routine I'd like to be able to compare the current status of the switches to a value that I can set for each mode, and as long as they are the same it will keep executing the sub-routine. I don't want to go back to the beginning each time, since the initial conditions will be written and overwrite the conditions in the sub-routine.

My problem is that I'm not sure how to compare the status of P2 to a register. For example, if "MODE 1" of my main check routine sets a value of 250 to register 5, how can I compare P2 to that value and jump back to the main check routine only when they do not equal each other? Can it be done without using the accumulator?

Thanks!