;功能簡述：通過8255動態(tài)控制4位數(shù)碼管，顯示緩沖為31H(低)~34H(高)
;
;
ORG 0000H
LJMP MAIN
ORG 0100H
MAIN: MOV A,#89H
MOV DPTR,#7FFFH
MOVX @DPTR,A
START: ACALL SEND
DD: ACALL DISP
AJMP DD
;顯示函數(shù)，顯示緩存為31H(低)~34H(高)
DISP: MOV R2,#01H
MOV R5,#4
MOV R0,#31H
DSP1:
MOV DPTR,#7CFFH
MOV A,R2
MOVX @DPTR,A
MOV A,@R0
DSP2: LCALL BCD
CPL A
MOV DPTR,#7DFFH
MOVX @DPTR,A
LCALL DEL0
LCALL DEL0
MOV A,R2
RL A
MOV R2,A
INC R0
DJNZ R5,DSP1
MOV A,#0FFH
MOV DPTR,#7DFFH
MOVX @DPTR,A
RET
DEL0: MOV R6,#00H
TM: MOV R7,#00H
DJNZ R7,$
DJNZ R6,TM
RET
;把要顯示的數(shù)據(jù)送到內(nèi)存單元31H~34H中去，
SEND: MOV R7,#4
MOV R0,#31H
MOV A,#01H
SS: MOV @R0,A
INC A
INC R0
DJNZ R7,SS
RET
;譯碼
BCD: INC A
MOVC A,@A+PC
RET
DB 03FH,06H,5BH,4FH,66H,6DH,7DH,07H
DB 7FH, 6FH,77H,7CH,39H,5EH,79H,71H
END
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