这些是基于dp51仿真仪的程序

				SDA		BIT	P1.0
				CLK		BIT	P1.1
				INPUT		BIT	P3.5
				LED_CS		BIT	P1.7
				
					ORG	4000H
					AJMP	MAIN
				
					ORG	4100H
				MAIN:
					MOV	SP,#60H
					SETB	INPUT
					clr	P1.7
				
				UP:	JNB	INPUT,NEXTP
					MOV	R2,#00
					AJMP	NEXTPP
				NEXTP:	MOV	R2,#0FFH	
				NEXTPP:	ACALL	TXDBYTE
					AJMP	UP
				
				;若发送的数据存放在R2中
				TXDBYTE:
					   PUSH	   PSW
					   PUSH	   ACC
					   MOV	   A,R2	
					   MOV	   R3,#08H
				TXDUP:	   RLC	   A
					   MOV	   SDA,C
					   CLR	   CLK
					   SETB	   CLK
					   DJNZ	   R3,TXDUP
					   POP	   ACC
				           POP	   PSW
					   RET
				
					   END