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Re: Atmel 328 ext. interupts

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Pull ups are enabled on the interupt input which is driven by a npn 
transistor pulling the Atmel's pullup resistor and a 10k resister tied to 
the positive rail.

Hul


DemonicTubes <tlackie@gmail.com> wrote:
> On Monday, April 23, 2018 at 2:31:53 PM UTC-6, Hul Tytus wrote:
> > sci.electronics.design
> > Atmel 328 external interupts
> > 
> >       I'm debugging an Atmel AVR 328 that won't generate an external #0 
> > interupt. At present, the timer1 is generating an overflow interupt as would 
> > be expected. The input for the #0 ext. interupt (pin 4, d port #2) has been 
> > set to generate a mimic signal on another pin, which worked well.
> >       The setup for interupt 0 is:
> >   ldi areg, 2                 ; external interupt #0 occurrs on fallling edge
> >   sts EICRA, areg
> >   ldi areg, 1                 ; enable interupt #0
> >   sts EIMSK, areg
> >       The possibly of a "power management" bit needing attention exists or maybe 
> > a variation between the 328 and the 168 device that I've missed. 
> > 
> > Anyone have a suggestion?
> > 
> > Hul

> Any chance you have pullups enabled on PORTD?  How are you driving the pin externally?

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Atmel 328 ext. interupts Hul Tytus <ht@panix.com> - 2018-04-23 20:31 +0000
  Re: Atmel 328 ext. interupts DemonicTubes <tlackie@gmail.com> - 2018-04-23 13:51 -0700
    Re: Atmel 328 ext. interupts Hul Tytus <ht@panix.com> - 2018-04-23 21:08 +0000
      Re: Atmel 328 ext. interupts DemonicTubes <tlackie@gmail.com> - 2018-04-23 14:18 -0700
  Re: Atmel 328 ext. interupts bitrex <user@example.net> - 2018-04-23 17:30 -0400
  Re: Atmel 328 ext. interupts bitrex <user@example.net> - 2018-04-23 17:59 -0400
  Re: Atmel 328 ext. interupts mpm <mpmillard@aol.com> - 2018-04-23 20:00 -0700
  Re: Atmel 328 ext. interupts Johann Klammer <klammerj@NOSPAM.a1.net> - 2018-04-24 11:35 +0200
    Re: Atmel 328 ext. interupts Hul Tytus <ht@panix.com> - 2018-04-24 15:29 +0000
    Re: Atmel 328 ext. interupts Hul Tytus <ht@panix.com> - 2018-04-24 15:58 +0000
      Re: Atmel 328 ext. interupts Johann Klammer <klammerj@NOSPAM.a1.net> - 2018-04-25 11:45 +0200
        Re: Atmel 328 ext. interupts Hul Tytus <ht@panix.com> - 2018-04-25 12:30 +0000

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