Well

And he must to have many atention with the time conversion, with xtal of 4
to 20 MHz, he must to put a little delay to see the conversion or to wait
the interrupt.

Regards
Santiago

Tjaart van der Walt escribi—:

> Andre Abelian wrote:
>
> > Hi to all engineers.
> > I am working with 16c71  to learn more about it.
> > this is what I know about it.
> >
> > 1. adres        A/D result will be in this register after conversion
> > 2. adcon1    to setup analog inputs and Voltage reference
> > 3. adcon0   conversion clock, analog channel select, and more
> >
> > I played with one A/D converter I got good result.
> > since I see only one result (adres) register  I do not imagine
> > using all four A/D converters where are you going to put
> > results from each A/D converter at the same time.
> >
> > Could you please explain how it works.
> >
>
> The A/D inputs are multiplexed to one A/D only. You haveto select which
> input you want to sample. The result of the
> A/D is alway in ADRES, so you have to pick the right channel.
> To do this, you have to set up ADCON0. I didn't have a
> PDF file for the 16C71 on-hand, but to explain it, here is
> the breakdown for the 16C74 (see bit 5-3) :
>
> ADCON0
>
> bit 7-6: ADCS1:ADCS0: A/D Conversion Clock Select bits
>             00 = FOSC/2
>             01 = FOSC/8
>             10 = FOSC/32
>             11 = FRC (clock derived from an internal RC oscillator)
> bit 5-3: CHS2:CHS0: Analog Channel Select bits
>             000 = channel 0, (RA0/AN0)
>             001 = channel 1, (RA1/AN1)
>             010 = channel 2, (RA2/AN2)
>             011 = channel 3, (RA3/AN3)
>             100 = channel 4, (RA5/AN4)
>             101 = channel 5, (RE0/AN5) (1)
>             110 = channel 6, (RE1/AN6) (1)
>             111 = channel 7, (RE2/AN7) (1)
> bit 2: GO/DONE: A/D Conversion Status bit
>             1 = A/D conversion in progress (setting this bit starts the
> A/D conversion)
>             0 = A/D conversion not in progress (This bit is
> automatically cleared by hardware when the A/D conversion
>             is complete)
> bit 1: Unimplemented: Read as '0'
> bit 0: ADON: A/D On bit
>             1 = A/D converter module is operating
>             0 = A/D converter module is shutoff and consumes no
> operating current
>
> --
> Friendly Regards
>
> Tjaart van der Walt
> mailto:tjaart@wasp.co.za
>  _____________________________________________________________
> | WASP International http://www.wasp.co.za/~tjaart/index.html |
> |       R&D Engineer : GSM peripheral services development    |
> |   Vehicle tracking | Telemetry systems | GSM data transfer  |
> |    Voice : +27-(0)11-622-8686 | Fax : +27-(0)11-622-8973    |
> |              WGS-84 : 26¡10.52'S 28¡06.19'E                 |
> |_____________________________________________________________|