mov a,r6         ;is added
jnz loop2        ;is added
mov a,r7         ;is added
jz end_of_loops  ;is added
djnz r7,$        ;is added
jmp end_of_loops ;is added
loop2:
mov a,r7         ;is added
jz loop1         ;is added
loop:   djnz r7,loop
loop1:  djnz r6,loop
end_of_loops:
        ret