ADC0809A/D转换器基本应用技术与设计

                   CLR ST
WAIT:        JNB EOC,WAIT
                   SETB OE
                   MOV GDATA,P0
                   CLR OE
                   MOV A,GDATA
                   MOV B,#100
                   DIV AB
                   MOV 33H,A
                   MOV A,B
                   MOV B,#10
                   DIV AB
                   MOV 34H,A
                   MOV 35H,B
                   SJMP WT
T0X: NOP
                   MOV TH0,#(65536-4000)/256
                   MOV TL0,#(65536-4000) MOD 256
                   MOV DPTR,#DPCD
                   MOV A,DPCNT
                   ADD A,#DPBUF
                   MOV R0,A
                   MOV A,@R0
                   MOVC A,@A+DPTR
                   MOV P1,A
                   MOV DPTR,#DPBT
                   MOV A,DPCNT
                   MOVC A,@A+DPTR
                   MOV P2,A
                   INC DPCNT
                   MOV A,DPCNT
                   CJNE A,#8,NEXT
                   MOV DPCNT,#00H
NEXT:       RETI
DPCD:       DB 3FH,06H,5BH,4FH,66H
                   DB 6DH,7DH,07H,7FH,6FH,00H
DPBT:       DB 0FEH,0FDH,0FBH,0F7H
                   DB 0EFH,0DFH,0BFH,07FH
                   END
8．C语言源程序
#include
unsigned char code dispbitcode[]={0xfe,0xfd,0xfb,0xf7,
                           　0xef,0xdf,0xbf,0x7f};
unsigned char code dispcode[]={0x3f,0x06,0x5b,0x4f,0x66,
                           0x6d,0x7d,0x07,0x7f,0x6f,0x00};
unsigned char dispbuf[8]={10,10,10,10,10,0,0,0};
unsigned char dispcount;
sbit ST=P3^0;
sbit OE=P3^1;
sbit EOC=P3^2;
unsigned char channel=0xbc;//IN3
unsigned char getdata;
void main(void)
{
  TMOD=0x01;
  TH0=(65536-4000)/256;
  TL0=(65536-4000)%6;
  TR0=1;
  ET0=1;
  EA=1;
  P3=channel;
  while(1)
    {
      ST=0;
      ST=1;
      ST=0;
      while(EOC==0);
      OE=1;
      getdata=P0;
      OE=0;
      dispbuf[2]=getdata/100;
      getdata=getdata;
      dispbuf[1]=getdata/10;
      dispbuf[0]=getdata;
    }
}
void t0(void) interrupt 1 using 0
{
  TH0=(65536-4000)/256;
  TL0=(65536-4000)%6;
  P1=dispcode[dispbuf[dispcount]];
  P2=dispbitcode[dispcount];
  dispcount++;
  if(dispcount==8)
    {
      dispcount=0;
    }
}

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本文关键字：转换器  应用技术  51单片机，单片机-工控设备 - 51单片机