piclist 2004\06\28\215204a >
Thread: ATtiny11s group buy list -- PIC group buy?
face picon face BY : William Chops Westfield email (remove spam text)

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.)


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