dz.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.

                ORG 00H
                LJMP START
                ORG 30H
      START:    MOV  R2,#0
                MOV  50H,#0
      START1:   MOV  DPTR,#TAB1
                MOV  A,R2
                MOVC A,@A+DPTR
                MOV  2AH,A
                LCALL WRITE5950_0
                INC  R2
                
                MOV  DPTR,#TAB
                MOV  A,50H
                MOVC A,@A+DPTR
                MOV P2,A
                CLR P1.1      ;STB
                NOP
                SETB P1.1
                NOP  
                LCALL DL2MS
                INC  50H
                MOV  A,50H
                CJNE A,#7,START1
                LJMP START
;---------------------WRITE5950--------------------------
WRITE5950_0:    MOV R5,#08H
                MOV A,2AH
LOOP:           RLC A
                MOV P1.2,C        ;列DATA  
                CLR P1.0          ;列CLK
                NOP
                SETB P1.0
                DJNZ R5,LOOP
                RET

;----------------------DL2MS-------------------------------
 DL2MS:         MOV 43H,#14H           ; every LED(2ms)
   DL2:         MOV 44H,#14H
   DL1:
                DJNZ 44H,DL1
                DJNZ 43H,DL2
                RET
;----------------------TAB--------------------------------
TAB:
DB  0FEH,0FDH,0FBH,0F7H,0EFH,0DFH,0BFH   ;行选择
;DB  01H,02H,04H,08H,10H,20H,40H
;----------------------TAB1-------------------------------
TAB1:
;db    20h, 20h, 50h, 70h, 88h, 88h, 00h    ;41h [A]
DB    55H
end