led广告屏程序设计.doc

ORG 0000H ??????? MOV R4,#08H??????? ;一个字，八字节代码 ??????? MOV P2,#0A0H?????? ;利用p2口第二功能 ??????? MOV R1,#00H ??????? MOV A,#00H ??????? MOVX @R1,A???????? ;关显示 ??????? NEW_CODE:MOV 61H,#04H????? ;此程序有四个字 ??????? MOV DPTR,#DIS_CODE ??????? ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; DIP:??? MOV 69H,#40H?????? ;一个字停留的速度 RD_DISP: ??????? MOV R3,#80H??????? ;选通一行 ??????? MOV R2,#00H??????? ;送出字码 RDISP1: MOV A,#00H???????? ;;;; ??????? MOVX @R1,A???????? ;;;;关显示 ??????? MOV A,R3?????????? ;;;; ??????? ??????? ACALL SEND???????? ;送出选通行代码 ??????? MOV A,R2?????????? ;;; ??????? MOVC A,@A+DPTR ??????? MOVX @R1,A???????? ;送出字码 ??????? ACALL DELAYT?????? ;延时 ??????? INC R2 ??????? MOV A,R3 ??????? RR A ??????? MOV R3,A ??????? DJNZ R4,RDISP1???? ;送完一个字代码吗？ ??????? MOV R4,#08H??????? ;重新初始化r4 ??????? DJNZ 69H,RD_DISP?? ;速度系数没有循环完，继续 ???? ??????? MOV R7,#08H??????? ;指针dptr加8 DEC_CODE:INC DPTR????????? ;指向下一个字代码 ??????? DJNZ R7,DEC_CODE?? ;四个字都循环了一遍了吗？ ??????? DJNZ 61H,DIP ??????? MOV 61H,#02H ??????? SJMP NEW_CODE SEND:?? MOV PCON,#80H????? ;初始化串行口 ??????? MOV TMOD,#20H????? ;为方式0 ??????? MOV TH1,#98H ??????? CLR ET1 ??????? SETB TR1 ??????? MOV SCON,#00H ??????? CLR ES ??????? MOV A,R3 ??????? MOV SBUF,A???????? ;把选通行代码送出 ??? W1: JNB TI,W1????????? ;等待数据送出 ??????? CLR TI???????????? ;数据送出后，中断标志清零 ??????? RET ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; DELAYT:MOV R7,#01H DLY1: MOV R6,#0FFH DLY2: DJNZ R6,DLY2 ????? DJNZ R7,DLY1 ????? RET DIS_CODE: DB 10H,0FEH,92H,0FEH,92H,0FEH,11H,1FH DIS_CODE1:DB 0FFH,0FFH,18H,18H,18H,18H,0FFH,0FFH DIS_CODE2: DB 10H,0FEH,92H,0FEH,92H,0FEH,11H,1FH DIS_CODE3: DB 3EH,04H,08H,0FFH,08H,04H,14H,08H