Re: [avr-chat] EEprom Read on Tiny13

[Michael Hennebry]

On Mon, 22 Oct 2007, Joerg Wunsch wrote:

> Robert von Knobloch <address@hidden> wrote:
>
> > The library functions, defined in "avr-libc-1.4.6/libc/misc/eeprom.S"
> > always write a 16-Bit address to the EEAR register. This is expressly
> > forbidden in the Tiny13 datasheet and is the cause of my problems.

> Too bad if that no longer works.  This trick used to work for all AVRs
> so far: the undefined EEARH register was just ignored.
>
> The bad thing about this is that working around that will introduce
> more flavors of EEPROM implementation functions inside the library,
> similar to the different register locations that are already
> implemented.

How about reading EEARH and only writing it if the new value is different?
If reading it is ok and it reads as zero,
then valid addresses shouldn't be a problem.

-- 
Mike   address@hidden
"Horse guts never lie."  -- Cherek Bear-Shoulders