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Need help on ADC 0804

noTon Tech

Hi All

can anybody tell me what is the purpose and usage of
9th pin Vref/2

or any related material related to this.
(just more that datasheet)

Thanks in Advance

Parents
  • 0 in reply to Andy Neil

    i have all the file but some prob in my circuit

    this is my circuit i29.tinypic.com/mto12r.jpg

    iam trying to read P2 value using AT89S8252 with following code. always its showing the value 0 only

    void timer0_int(void) interrupt 1{
    if(++int0count == 1000){
        if(pv3=='0'){READ=0;++rval;}
        pval=P2;
        printf("Reading = %bx.\n",pval);
        if(pv3=='0'&&rval>'1'){READ=1;rval=0;}
        int0count = 0;
    }
}

    i have initialized the adc with the following code.

            READ=1;WRITE=1;INTP=1;
        delayloop(1);
        WRITE=0;
        delayloop(1);
        WRITE=1;

    still what else iam missing other than the sence? :)

Reply
  • 0 in reply to Andy Neil

    i have all the file but some prob in my circuit

    this is my circuit i29.tinypic.com/mto12r.jpg

    iam trying to read P2 value using AT89S8252 with following code. always its showing the value 0 only

    void timer0_int(void) interrupt 1{
    if(++int0count == 1000){
        if(pv3=='0'){READ=0;++rval;}
        pval=P2;
        printf("Reading = %bx.\n",pval);
        if(pv3=='0'&&rval>'1'){READ=1;rval=0;}
        int0count = 0;
    }
}

    i have initialized the adc with the following code.

            READ=1;WRITE=1;INTP=1;
        delayloop(1);
        WRITE=0;
        delayloop(1);
        WRITE=1;

    still what else iam missing other than the sence? :)

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