if in doubt, maybe use a compiler first.

This C-snippet:

#include <8052.h>

void main(void)
{
    while(1)
    {
       P2_0 = P1_0 ^ P1_1;
    }
}

 

might be what you want to do.


F.e. SDCC compiles this to:

   001C                     356 _main:
                            365 ;       xor2.c:5: while(1)
   001C                     366 00102$:
                            367 ;       xor2.c:7: P2_0 = P1_0 ^ P1_1;
   001C A2 91               368         mov     c,_P1_1
   001E 30 90 01            369         jnb     _P1_0,00107$
   0021 B3                  370         cpl     c
   0022                     371 00107$:
   0022 92 A0               372         mov     _P2_0,c
   0024 80 F6               373         sjmp    00102$