org 0000h clr p2.1 ajmp z0 du: acall q1 mov a,#0a0h add a,r5 acall so80 mov a,r3 acall so80 acall q1 mov a,#0a1h add a,r5 acall so80 acall do80 acall stop1 mov b,a acall yan ret xie: acall q2 mov a,#0a0h add a,r5 acall xe80 mov a,r3 acall xe80 mov a,b acall xe80 acall stop2 acall yan ret so80: mov r