Hi Pranav,

there is no need to disable interrupts, if you update the shadow register always at first.
Also you should use any RAM location, but not the working registers R0..R7. Since the working registers intended for working (changed often), not for permanent storing of values.


E.g.:
p2_shadow equ 30h

mov_p2 macro new_val
mov p2_shadow, new_val
mov p2, new_val
endm


Peter