?? 0-2.55v.asm
字號(hào):
org 0000h
START: MOV 30h,#3bH
MOV 31h,#3aH
MOV 32h,#39H
SETB P3.4
SETB P3.5
CLR P3.6 ;選擇ADC0808的通道3
WAIT: CLR p3.2
SETB p3.2
CLR p3.2 ;啟動(dòng)轉(zhuǎn)換
JNB p3.1,$ ;等待轉(zhuǎn)換結(jié)束
SETB p3.0 ;允許輸出
MOV 35h,P1 ;暫存轉(zhuǎn)換結(jié)果
CLR p3.0 ;關(guān)閉輸出
MOV A,35h
;HEXTBCD:
MOV A,35H
MOV B,#100
DIV AB
;rlc a
MOV 3BH,A
MOV A,B
MOV B,#10
DIV AB
MOV 3AH,A
MOV 39H,B
; RET
LCALL DISP ;顯示AD轉(zhuǎn)換結(jié)果
SJMP WAIT
DISP:
MOV A,#0FEH
MOV P2,A
MOV A,3BH
MOV DPTR,#TABLE
MOVC A,@A+DPTR
ORL A,#80H ;加小數(shù)點(diǎn)
MOV P0,A
CALL DELAY
MOV A, #0FDH
MOV P2,A
MOV A,3AH
MOV DPTR, #TABLE
MOVC A,@A+DPTR
;ORL A,#80H ;加小數(shù)點(diǎn)
MOV P0,A
LCALL DELAY
MOV A, #0FBH
MOV P2,A
MOV A,39H
MOV DPTR, #TABLE
MOVC A,@A+DPTR
;ORL A,#80H ;加小數(shù)點(diǎn)
MOV P0,A
LCALL DELAY
MOV A, #0F7H
MOV P2,A
MOV A,38H
MOV DPTR, #TABLE
MOVC A,@A+DPTR
MOV P0,A
LCALL DELAY
RET
TABLE:DB 3FH,06H,5BH,4FH,66H
DB 6DH,7DH,07H,7FH,6FH
DELAY:MOV 40,#34H
D0:MOV 41,#19H
D1:DJNZ 41,D1
DJNZ 40,D0
RET
END
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