Tom=E1s,

You stated, "...I powered LED's from PIC pins and didn't use =

current-limiting resistors. I had seven of these on at once. Not only was I =

taking more current from a pin that I should have, but I also took too much =

current overall for the entire chip."

Questions:
1. Which PIC?
2. At what speed and supply voltage were you running it?
3. Were you sinking or sourcing current from/to the LEDs?
4. Which pins were you using (multiple ports or all on one port)?
5. Which LEDs (current/voltage specs)?
6. How were the LEDs connected?
7. Were there only seven total LEDs?
8. If not, were the same seven LED's always on during the test?
9. If all LEDs were always on, was there no change taking place in the =

program? In other words, was it always at the same line once the LEDs were =

turned on?
10. If no change, how did you determine there wasn't a glitch?

"taking more..." and "...took too much..." don't mean much without more =

specific information. Please explain.

Thanks,
Richard


----- Original Message ----- =

From: "Tom=E1s =D3 h=C9ilidhe" <toe@lavabit.com>
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
Sent: Wednesday, June 18, 2008 8:53 AM
Subject: Re: [PIC] Max speed from 887


>
>
> David Meiklejohn wrote:
>> This makes me wonder (please note - I am NOT advocating this, I don't =

>> want
>> to do it - it's just curiosity), has anyone here tried "overclocking" any
>> PICs?  How did it go?  What speeds did you achieve?
>
> My guess is you could probably get WAY more than 20 MHz out of it.
>
> PIC datasheets are extremely safe, from my experience with them. For a
> college project, I powered LED's from PIC pins and didn't use
> current-limiting resistors. I had seven of these on at once. Not only
> was I taking more current from a pin that I should have, but I also took
> too much current overall for the entire chip. But the project board
> worked perfectly, I left it on overnight for three nights in a row
> without a glitch.
>
> (Of course, three nights isn't equal to 30 years, but it shows what
> these chips can do)
>
> -- =

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