AVR-Chat

I have used that approach to decode RC5 frames from an IR receiver 
on a Tiny11 running with the 1.2MHz internal oscillator.
	Worked 100%.

	Mark Jordan


On 12 Sep 2006 at 15:59, Larry Barello wrote:

> Look for ceramic resonators with built in capacitors (three terminal
> devices) at digikey.  They work pretty well.
> 
> It seems with a little thought that the pulses could be discriminated using
> the internal oscillator.  Use the first pulse to "calibrate" the clock with
> upper and lower bounds for "valid" and then use the calibrated values to
> measure the remaining pulse on/off periods.  The internal oscillator will be
> extremely stable over a couple second period.  
> 
> 
> | -----Original Message-----
> | From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf
> | Of Richard Cooke
> | Sent: Tuesday, September 12, 2006 1:46 PM
> | To: AVR-Chat@yahoogroups.com
> | Subject: [QUARANTINE] [AVR-Chat] Re: Help with Attiny project
> | Importance: Low
> | 
> | Thanks for the info.  I've looked at the ATtiny13 datasheet and I'm a
> | bit confused on how you'd connect an external crystal.  On the
> | Attiny11 and 12 you sacrifice 2 pins to use the crystal (PB3 & PB4).
> | How does that connect to the '13?  I haven't used a ceramic resonator
> | before - can I just connect it to PB3?  Does it require any additional
> | components?  Sorry all of the bacic questions but it's been awhile
> | since I've done work on such small parts.
> | 
> | Thanks,
> | 
> | Richard
> | 
> | --- In AVR-Chat@yahoogroups.com, "David VanHorn" <microbrix@...> wrote:
> | >
> | > The internal timer isn't that accurate over temperature.
> | >
> | > You might be able to get away with something like this:
> | >
> | > Sit in a loop, waiting for something.
> | > Pulse detected.
> | > Wait about 3/4 of the delay, a pulse in here fails.
> | > Wait about 1/2 the delay, no-pulse in here fails.
> | > Resync on each detected pulse, and then be pretty tolerant about
> | when pulses
> | > can come in.
> | >
> | > Otherwise, a resonator or crystal is a better bet.
> | >
> | >
> | > [Non-text portions of this message have been removed]
> | >
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