led_a51.asm

MCS-51单片机实验 39个实用实验和源码

;*********LED 点阵显示示例程序***********************
;**   	  该程序显示 ASC16字符                     **
;**    为了简单起见，程序只显示一个字符            **
;**    该程序针对EAT598实验机                      **
;****************************************************
CSLED EQU 0F200H
CSC1  EQU CSLED		;列1~8  273
CSC2  EQU CSLED+1H	;列9~16 273
CSR1  EQU CSLED+2H	;行1~8  374
CSR2  EQU CSLED+3H	;行9~`6 374
	
	ORG 0000H
    SJMP MAIN
    ORG  0040H
MAIN:    
	MOV SP,#60H
INIT:
	MOV A,#00H		;关闭LED列显示
	MOV DPTR,#CSC1     
	MOVX @DPTR,A
	MOV DPTR,#CSC2
	MOVX @DPTR,A
	MOV A,#0FFH	    ;关闭LED行显示  
	MOV DPTR,#CSR1
	MOVX @DPTR,A
	MOV DPTR,#CSR2
	MOVX @DPTR,A

D:	MOV R5,#00H
	MOV R4,#01H	    ;设定列扫描初始值,从第一列开始
	
DISP:	
	MOV A,R5
	MOV DPTR,#ASCK  ;此处设定所要显示的字符
	MOVC A,@A+DPTR
	CPL ACC		    ;代码取反,决定显示的阴阳
	MOV DPTR,#CSR1
	MOVX @DPTR,A

	MOV DPTR,#CSC1
	MOV A,R4
	MOVX @DPTR,A
	
	RL  ACC
	MOV R4,ACC
	INC R5
	LCALL DELAY
	
	MOV A,#00H			;清上次显示值
	MOVX @DPTR,A        ;关闭行、列
    MOV DPTR,#CSR1
    MOV  A,#0FFH
 	MOVX @DPTR,A	
	CJNE R5,#8H,DISP    ;判是否显示到第八列
	
	MOV R5,#08H
	MOV R4,#01H
DISP2:	
	MOV A,R5
	MOV DPTR,#ASCK
	MOVC A,@A+DPTR
	CPL ACC
	MOV DPTR,#CSR2
	MOVX @DPTR,A
	
	MOV DPTR,#CSC1
	MOV	A,R4
	MOVX @DPTR,A
	
	RL  ACC
	MOV R4,ACC
	INC R5
	LCALL DELAY

	MOV A,#00H           ;清上次显示值
	MOVX @DPTR,A         ;关闭行、列
	MOV  A,#0FFH
	MOV DPTR,#CSR2
 	MOVX @DPTR,A		
	CJNE R5,#10H,DISP2 	 ;判是否扫描到第十六列
	SJMP D
;********  延时子程序,协调字符显示速度  *************
DELAY:	MOV R7,#01H
DL1:	MOV R6,#00H
DL2:	DJNZ R6,DL2
	    DJNZ R7,DL1
	    RET	    
		
;********        字符点阵字库         ***************

;      请注意编码的排列次序和实际显示点阵分布的关系	
;运行ZIMO.EXE程序，在参数设置里选择“纵向取模”，16*16点阵，宋体、小四号(12)
;取模方式为A51格式。
;*****************************************************		
ASCA:DB  00H,00H,03H,1CH,07H,00H,00H,00H,04H,3CH,0C4H,40H,40H,0E4H,1CH,04H

ASCE:DB  10H,1FH,11H,11H,17H,10H,08H,00H,04H,0FCH,04H,04H,0C4H,04H,18H,00H
  	 
ASCD:DB  10H,1FH,10H,10H,10H,08H,07H,00H,04H,0FCH,04H,04H,04H,08H,0F0H,00H

ASCK:DB  10H,1FH,11H,03H,14H,18H,10H,00H,04H,0FCH,04H,80H,64H,1CH,04H,00H
;****************************************************
  	
  	
  	
  	END