adc
7
ORG 0000H READ BIT P2.0 WRITE BIT P2.1 INTR BIT P2.2 ACALL INIT MOV P3,#0FFH SETB INTR START: CLR WRITE SETB READ CALL DELAY SETB WRITE CALL DELAY JB INTR,$ CLR READ CALL CONV
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at89c51 adc interfacing code
Transcript of adc
ORG 0000H
READ BIT P2.0
WRITE BIT P2.1
INTR BIT P2.2
ACALL INIT
MOV P3,#0FFH
SETB INTR
START:
CLR WRITE
SETB READ
CALL DELAY
SETB WRITE
CALL DELAY
JB INTR,$
CLR READ
CALL CONV
CALL DISPLAY
ACALL DELAY1
SJMP START
INIT:
MOV A,#38H
ACALL COM
MOV A,#0EH
ACALL COM
MOV A,#01H
ACALL COM
RET
CONV:
MOV A,P3
MOV B,#10
DIV AB
MOV R7,B
MOV B,#10
DIV AB
MOV R6,B
MOV R5,A
RET
DISPLAY:
MOV A,#01H
ACALL COM
MOV A,#80H
ACALL COM
MOV R4,#08D
MOV A,#00H
MOV DPTR,#MYDATA
NEXT:CLR A
MOVC A,@A+DPTR
ACALL DATA1
INC DPTR
CLR A
DJNZ R4,NEXT
MOV A,R5
ADD A,#30H
ACALL DATA1
MOV A,R6
ADD A,#30H
ACALL DATA1
MOV A,R7
ADD A,#30H
ACALL DATA1
RET
COM:
ACALL CHKDB7
CLR P2.5
CLR P2.6
SETB P2.7
MOV P1,A
CLR P2.7
RET
DATA1:
ACALL CHKDB7
SETB P2.5
CLR P2.6
SETB P2.7
MOV P1,A
CLR P2.7
RET
CHKDB7:
SETB P1.7
CLR P2.5
SETB P2.6
BAC:CLR P2.7
SETB P2.7
JB P1.7, BAC
RET
DELAY:
MOV R2,#0AAH
DJNZ R2,$
RET
DELAY1:
MOV R0,#08h
OUT3:MOV R1,#0FFh
OUT2: MOV R2,#0FFh
DJNZ R2,$
DJNZ R1,OUT2
DJNZ R0,OUT3
RET
MYDATA:DB "DATA IS:"
END
