Re: TI-H: More AVR Qs
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Re: TI-H: More AVR Qs
>From: Grant Stockly <gussie@stockly.com>
>> >Would the internal RC clock get me that kind of accuracy (withing a
>couple
>> >of seconds a month)?
>>
>> If you keep the temperature of the AVR THE SAME.
>
>Do you have any idea how much the clock speed would vary by between about 70
>and 90 degrees F? If the variance is reasonably low I can probably deal
>with it. Even it isn't low, I could plot it and include a table to correct
>for it (there will be a temp sensor on the device, so I could use the
>current temp to look up the ticks/second value and use that to more
>accurately determine the correct delay time). I've got plenty of code
>space, and physical is a premium, so it wouldn't be a big problem. Anyway,
>I haven't decided yet, a crystal might be the simplest.
Not much. You're digital, so it doesn't matter anyway. I forgot.
>Currently I'm trying to use the programmer from the BA1FB site, apparently a
>serial programmer that connects to the computers parallel port. Are there
>any parallel programmers that connect the same way (of course they would
>require a 12v source too)?
Very good. Serial are MUCH simpler and the serial programmers (for
parallel port) are just the same speed (5 seconds for a full chip).
>If not I'll see about writing one that just sets that RC enable bit. Then I
>can just program it in serial mode and then set the bit in parallel mode.
>
>What is Marshall's web site? I'd like to request some samples.
>
>Thanks
>DK
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