书籍8051入门篇

				;PROGRAM NAME:12-5-2.ASM
				$MOD51
				BUFFER		DATA	20H
				SCOPE_CH1 	EQU	P3.7		;接到示波器CH1上观察
				;
						ORG	0000H
						MOV	SP,#50H		;累加器=00H
						MOV	A,#00H		;设定堆栈=00H
						MOV	BUFFER,A	;(20H)=00H
				LOOP:		MOV	P1,BUFFER	;P1=(BUFFER)
						INC	BUFFER		;将BUFFER内容加上1
						LCALL	DELAY		;延迟一小段时间
						SJMP	LOOP
				;ROUTINE
				;单纯时间延迟用
				DELAY:		SETB	SCOPE_CH1
						MOV	R0,#00H
				DLY:		MOV	R1,#00H	
						DJNZ	R1,$
						DJNZ	R0,DELAY
						CLR	SCOPE_CH1
						RET
						END