2.asm

在传一些用另外一种方法控制的LED显示屏的原程序,看看.

         
;---------------------------------------------------------------
; 说    明 : 行控制由P2.0--P2.6口;列由595控制,p1.0--CLK,P1.1--STB,P1.2--DATA
;---------------------------------------------------------------

         
         SCLK_595   EQU  P1.0   ;移位时钟脉冲
         RCK_595    EQU  P1.1   ;输出锁存器控制脉冲
         SDATA_595  EQU  P1.2   ;串行数据输入
;================================================

                ORG   0000H
                LJMP  MAIN
                ORG   0030H
;================================================

  MAIN:         MOV  P2,#0FFH
                MOV  R0,#0 
                MOV  R1,#0
                MOV  R2,#0
					 MOV  R3,#0

 MAIN1:         MOV  DPTR,#TAB
                MOV  A,R2
                MOVC A,@A+DPTR
                MOV  R0,A
                CALL OUT_595
					 CALL OUT_4953
  LOOP:	   	 CALL DELAY     
					 INC  R2                          
				    CJNE R2,#7,MAIN1
					 LJMP MAIN
;---------------------------------------------------------------
;行输出数据子程序
;---------------------------------------------------------------
OUT_4953:   
                MOV  DPTR,#TAB1
                MOV  A,R1
					 MOVC A,@A+DPTR
					 MOV  P2,A  
 					 INC  R1
					 CJNE  R1,#7,LOOP
					 MOV  R1,#0
				    RET         
;---------------------------------------------------------------
;输出锁存器输出数据子程序
;---------------------------------------------------------------
OUT_595:
                LCALL WR_595
                CLR  RCK_595
                NOP
                NOP
                SETB RCK_595      ;上升沿将数据送到输出锁存器
                NOP
                NOP
                NOP
                CLR  RCK_595
                RET
;--------------------------------------------------------------
;移位寄存器接收数据子程序
;--------------------------------------------------------------
WR_595:         
                MOV R4,#08H         
                MOV A,R0
WR_LOOP:        
                RLC A
                MOV SDATA_595,C
                SETB SCLK_595       ;上升沿发生移位
                NOP
                NOP
                CLR SCLK_595
                DJNZ R4,WR_LOOP
                RET
;--------------------------------------------------------------
;延时子程序
;--------------------------------------------------------------
DELAY:          
                MOV 43H,#14H           ; every LED(2ms)
   DL2:         MOV 44H,#14H
   DL1:
                DJNZ 44H,DL1
                DJNZ 43H,DL2
                RET
;---------------------------------------------------------------
;表子程序
;---------------------------------------------------------------
TAB:
DB  0FBH,0F5H,0EEH,0EEH,0E0H,0EEH,0EEH   ;字"A"

TAB1:
DB  0FEH,0FDH,0FBH,0F7H,0EFH,0DFH,0BFH   ;行选择

                END