Re: [avr-chat] M8535 ports

[Royce & Sharal Pereira]

On Thu, 24 Mar 2005 10:51:32 +0530, Hugo González Monteverde  
<address@hidden> wrote:

> What are you using as a power supply...? How much current are the pins  
> supposed to be sourcing?

Its a standard 7805 circuit..The pins are driving BC557 (PNP) transistor  
bases via 4k7 base resistors. And the emitters are connected to Vcc.

                E | VCC
         4k7     /
   PIN----^^^^--|
               B \ C
                  |_____ to load.
> Hugo
>
> Royce & Sharal Pereira wrote:
> > Hi,
> > I just noticed this on a m8535 project I'm debugging.. I have a PORTC  
> > pin  as o/p, programmed high. But when I switch a neighbouring port  
> > line, the  other drops from 5V to 3.7V, also it seeems to be slowly  
> > oscillating from  3.7V to 5v. I tried external pullups etc. but to no  
> > effect. Does any one  have a clue?
> >  Thanks,
> > --Royce.
> >   _______________________________________________
> > AVR-chat mailing list
> > address@hidden
> > http://lists.nongnu.org/mailman/listinfo/avr-chat



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