原理圖：
代碼：ORG 0000H
AJMP START
ORG 0013H
AJMP X1_INT
START:
MOV SP, #60H
MOV IE, #84H
MOV R3, #0
MAIN:
LCALL DISPLAY
SJMP MAIN
X1_INT:
MOV A, R3
ADD A, #1
DA A
MOV R3, A ;R3 = 00~99H
X1_LOOP:
LCALL DISPLAY
JNB P3.3, X1_LOOP
RETI
DISPLAY:
MOV A, R3
ANL A, #0FH ;取出個bai位.
MOV DPTR, #TAB
MOVC A, @A + DPTR
MOV P2, #0FFH ;關閉du顯示.
MOV P0, A ;輸出段碼.
CLR P2.1 ;P2.1=0
LCALL DELAY
MOV A, R3
SWAP A
ANL A, #0FH ;取出十位.
MOVC A, @A + DPTR
MOV P2, #0FFH ;關閉顯示.
MOV P0, A ;輸出段碼.
CLR P2.0 ;P2.0=0
LCALL DELAY
RET
DELAY:
MOV R4, #250
DJNZ R4, $
RET
TAB:
DB 3FH, 06H, 5BH, 4FH, 66H
DB 6DH, 7DH, 07H, 7FH, 6FH
end
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