ledkey.asm

来自「单片机程序」· 汇编 代码 · 共 62 行

;8个led循环5次右移；然后5次左移。
	org 0000h
	ajmp START1
	org 0003h          
	reti
	org 000bh
	reti
	org 0013h
	reti
	org 001bh
	reti
	org 0023h
	reti
	
	
        org 0030h
start1:MOV SP,#60H              
       SETB P1.6                   
       SETB P3.5
       MOV R0,#00H    
       MOV R1,#00H 
       MOV R2,#02H   
       SETB F0
       MOV A,#80H            
       MOV TMOD,#01H           
       MOV TL0,#00H            
       MOV TH0,#00H
 LOOPM:SETB P1.6              
       ACALL SOUT
       CLR P1.6
       SETB TR0                
       INC R1
       CJNE R1,#08H,LOOPN
       INC R0
       MOV R1,#00H
 LOOPN:JNB TF0,$                
       CLR TF0                  
       MOV TL0,#00H          
       MOV TH0,#00H
       DJNZ R2,LOOPN
       MOV R2,#03H
       CJNE R0,#02H,LOOPO
       CPL F0
       MOV R0,#00H
 LOOPO:JNB F0,LOOPA
       RR A
       SJMP LOOPM
 LOOPA:
       RL A
       SJMP LOOPM
 

       
  SOUT:MOV SBUF,A
       JNB TI,$
       CLR TI                 
       RET  
       END