I'd Guess you have the charge pump clock clocking the "data".

If it doesn't offend you I suggest checking the wiring to look for
missing ground or an EXTRA ground to a charge cap that is NOT supposed
to be there.

Kathy Quinlan wrote:

>Hi all :o)
>
>Ok I have an AVR 8515 (but any Uc will do this) I connected it up as per the
>destruction manual (correctly as a new chip fixed the fault) my program is
>set to receive a byte, and then dump one out back to the PC. nothing
>happened under hyperterm, but using term95 (from my beloved Norton's
>commander) in hex mode I found that with every byte I sent, the result was
>above normal 7 bit hex (infact shifted one bit to the left (^2)) and a byte
>of 00h followed it.
>
>Now correct me if I am wrong the MAX 232 only level shifts and inverts (plus
>generates the + - 10V) so how can it do this ??
>
>Yes I did remove the AVR and short the TX and RX ttl lines and same problem
>so it has to be the MAX 232 (it is built on strip board but the tracks and
>jumpers are less than 2")
>
>Any ideas ???
>
>Regards,
>
>Kat.
>

--
  *
  |  __O    Thomas C. Sefranek  tcs@cmcorp.com
  |_-\<,_   Amateur Radio Operator: WA1RHP
  (*)/ (*)  Bicycle mobile on 145.41, 448.625 MHz

ARRL Instructor, Technical Specialist, VE Contact.
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http://www.harvardrepeater.org

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