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'[AVR:] ATtiny11s group buy list -- PIC group buy?'
2004\06\28@183940 by Jason S

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In quantity of 100+, the 629 is 6 cents more than 508A.  For the flash
program memory and EEPROM alone, I think there's no question that it would
have to be the 629 over the 508/509.  The 675 is also a good option.

I don't even know if a larger quantity has a price break though, and if it's
just 100 units, we may as well order directly.

Jason


{Original Message removed}

2004\06\28@192202 by David W.S. King

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Well I need 100 F508's or F509's within a few weeks and will be
ordering about
3000 of the 508OTP's by September.

I know a few others are using the 508/509 or 675's in projects etc.

The price I see for them is about 82 cents each in 100's. It helps
having one office within 2 blocks of Microchip to pester them but
I usually end up with them up here north of the border.

Its too bad the tiny11 needs an external xtal to work, the price
was pretty good. Looks like the tiny12 is about the same as a
508/509

Dave

{Quote hidden}

> > > {Original Message removed}

2004\06\28@192921 by Alex Harford

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On Mon, 28 Jun 2004 16:18:00 -0700, David W.S. King <spam_OUTkingdwsTakeThisOuTspamshaw.ca> wrote:
>
> Its too bad the tiny11 needs an external xtal to work, the price
> was pretty good. Looks like the tiny12 is about the same as a
> 508/509

Hmm?  The attiny11 has a 1MHz rc oscillator onboard.

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2004\06\28@194000 by Ben Hencke

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and an external RC option. (doesnt need an xtal)

On Mon, 28 Jun 2004 16:29:06 -0700, Alex Harford <harfordspamKILLspamgmail.com> wrote:
>
> On Mon, 28 Jun 2004 16:18:00 -0700, David W.S. King <.....kingdwsKILLspamspam.....shaw.ca> wrote:
> >
> > Its too bad the tiny11 needs an external xtal to work, the price
> > was pretty good. Looks like the tiny12 is about the same as a
> > 508/509
>
> Hmm?  The attiny11 has a 1MHz rc oscillator onboard.
>
>
>
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2004\06\28@210558 by Dave Lag

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Really ? I read the summary pdf and took away the same impression
(no onboard osc)
quote: internal calibrated oscillator (ATtiny12)
I couldn't figure out why you guys were excited about a device w 4 pins
tied up for
pwr and xtal.

At 07:29 PM 6/28/04, you wrote:

>On Mon, 28 Jun 2004 16:18:00 -0700, David W.S. King <@spam@kingdwsKILLspamspamshaw.ca> wrote:
> >
> > Its too bad the tiny11 needs an external xtal to work, the price
> > was pretty good. Looks like the tiny12 is about the same as a
> > 508/509
>
>Hmm?  The attiny11 has a 1MHz rc oscillator onboard.
>
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2004\06\28@211359 by David VanHorn

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At 09:07 PM 6/28/2004 -0400, Dave Lag wrote:

>Really ? I read the summary pdf and took away the same impression
>(no onboard osc)
>quote: internal calibrated oscillator (ATtiny12)

I'm getting the same impression.
Everywhere they talk about the R/C, they talk about the 12, not the 11.

Except on page 6, where they list cksel fuse settings for internal R/C on the tiny-11, and just below that where they state:

The internal RC oscillator option is an on-chip oscillator running at a fixed frequency of 1
MHz in ATtiny11 and 1.2 MHz in ATtiny12. If selected, the device can operate with no
external components. The device is shipped with this option selected. On ATtiny11, the
Watchdog Oscillator is used as a clock, while ATtiny12 uses a separate calibrated
oscillator.

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2004\06\28@215204 by William Chops Westfield

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On Jun 28, 2004, at 6:07 PM, Dave Lag wrote:

> I read the summary pdf and took away the same impression
> (no onboard osc)
> quote: internal calibrated oscillator (ATtiny12)
>

From page 6:

Internal RC Oscillator The internal RC oscillator option is an on-chip
oscillator running at a fixed frequency of 1 MHz in ATtiny11 and 1.2
MHz in ATtiny12. If selected, the device can operate with no external
components. The device is shipped with this option selected. On
ATtiny11, the Watchdog Oscillator is used as a clock, while ATtiny12
uses a separate calibrated oscillator.
-------

So you get a separate calibrated clock on the tiny12, but both parts
have an internal oscillator.

That probably means it's not very suitable for async serial comm,
without continuous calibration.  there's a nice graph on page 67 that
shows how nicely the watchdog oscillator varys with supply voltage
(from 200kHz at 2.5V to 1.5Mhz at 6V.  Ouch.)

BillW

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2004\06\29@013859 by David VanHorn

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>
>That probably means it's not very suitable for async serial comm,
>without continuous calibration.  there's a nice graph on page 67 that
>shows how nicely the watchdog oscillator varys with supply voltage
>(from 200kHz at 2.5V to 1.5Mhz at 6V.  Ouch.)

So have the processor change VCC to adjust the clock. :)

I was just reminded that I do have an application, and a slice of fifty wouldn't be a bad idea.  It was written for a 2343, but it uses no ram.  A micro repeater controller, for a friend in the two-way radio business.  Courtesy tone, Morse code ID at programmable intervals, hang timer, COR debounce, and a few other niceties.
No precision timing needed, and two spare pins yet.

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