书籍8051入门篇

				;11-8-1.ASM
				$MOD51
					ORG	0000H
				START:	MOV	TMOD,#20H	; TIMER1 = MODE2
					MOV	TH1,#0FDH	; 9600b/s
					SETB	TR1		; START TIMER1
					MOV	SCON,#50H	; SERIAL MODE1, ENABLE UART
					CLR	RI		; RI=0
				;
				WAIT:	JNB	RI,WAIT		; WAIT FOR RECEIVE OK
					CLR	RI		; RI=0
					MOV	A,SBUF		; READ DATA
					CPL	A		; CPL ACC
					MOV	P1,A		; SHOW DATA ON P1 
					SJMP	WAIT		;WAIT NEXT BYTE
				;
					END