双工.txt

51单片机与双工及单工通信

	ORG 0000H
	MOV SP,#70H
	MOV SCON,#90H
LOOP1:MOV A,P1
	MOV SBUF,A
LOOP2:JNB TI,LOOP3
NEXT:	 CLR TI
LOOP3:JNB RI,LOOP2
	CLR RI
	MOV A,SBUF
	ORL A,#0FH
	MOV P1,A
	JB TI,NEXT 
 SJMP LOOP1
END