song1.asm

串行口方式1,利用二片单片机间的数据串行传递

       ORG 0000H
       LJMP START
       ORG 30H
START: MOV SP,#5FH
       MOV TMOD,#00100000B  ;定时器1 方式2
       MOV TL1,#0FDH
       MOV TH1,#0FDH
       ORL PCON,#10000000B  ;SMOD=1
       SETB TR1
       MOV SCON,#01000000B  ;串行口方式1
       MOV A,#0AAH
SEND:  MOV SBUF,A
LOOP:  JBC TI,NEXT
       LJMP LOOP
NEXT:  LCALL DELAY
       JB P1.7,$
       CPL A
       JNB P1.7,$
       JMP SEND
DELAY: MOV R2,#0FAH
L1:    MOV R3,#0FAH
L2:    DJNZ R3,L2
       DJNZ R2,L1
       RET
       END