ex8-1.asm

本文件好似一系列的仿真

	ORG 0000H
START:	LJMP MAIN
	ORG 0030H
MAIN:	MOV DPTR,#7FFFH
	MOV A,#20H
LOOP: 	MOVX @DPTR,A
	JNB P1.0,INCD
	JNB P1.2,DECD
	SJMP LOOP
INCD:	ADD A,#20H
	CJNE A,#0E0H,LOOP
	MOV  A,#20H
	SJMP LOOP
DECD:	CLR  C
	SUBB A,#20H
	CJNE A,#00H,LOOP
	MOV A,#20H
	SJMP LOOP
  	END