Sorry but I don't agree. You do not have to wait for an interrupt (its
kind of a nonsense). You keep on doing other things that don't depend on
the result of the conversion, the ADC hardware will interrupt these other
things when the conversion finishes.
        That is exactly the point with interrupts. Your program can keep doing
usefull things instead of halting in useless loops when it needs to deal
with slow peripheral hardware, or slow events like human people pushing
buttons and so.

        Jorge F


At 01:03 98.03.14 +0100, you wrote:
>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    |
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>> |_____________________________________________________________|
>
===============================================================
cumprimentos / best regards
      Jorge Ferreira          mailto://jorgegf@mail.telepac.pt
------ Make sure brain is in gear before engaging mouth -------
===============================================================