AVR-Chat

Hi Rich -

Not sure you will get much of a response, here. It is a very low traffic list. AVR Freaks is the much more used forum.

I don’t have any Tiny24 experience. But the AVR Mega and Tiny devices are very consistent across the whole family and I don’t expect any difference, especially with something as standard as EEPROM. 

Which address are you writing and reading? Address 0x00 has a history of problems. Using Brownout Detect really helps that. Are you using BOD?

Jim

James Wagner
Oregon Research Electronics
http://www.orelectronics.net <http://www.orelectronics.net/>




> On Mar 19, 2017, at 8:49 AM, richros@adamswells.com [AVR-Chat] <AVR-Chat@yahoogroups.com> wrote:
> 
> I'm an old-timer in micro's, started back in the mid-70's and have experience in
> just about every one made up through 2002.  (Started with Intel's 4004 & 8008.)
> Didn't get to do much with the Atmel devices then but made up for it since
> retiring.
> 
> I've used most of the ATTiny and some of the ATMega devices and have used
> the EEPROM in several.  This is the first time I used it on the ATTiny24 and
> I've put in nearly a 40 hour week trying to tame it!
> 
> I've used the programming examples right out of the spec sheet and several
> variations of it but no cigars!  I'm pretty sure that the Write works, I can
> program several bytes and then read the micro's EEProm with the AVR
> Studio 4's HEX file read capability.  I can shut down everything and it's
> still there after a complete power-up.  The problem is that everytime I
> do an EEPROM_Read it erases everything.  I don't see anything in the
> specs about a bulk erase!  
> 
> Is there a problem with the ATTiny24A?  The same sequence works with all
> the other devices.
> 
> 
> 
> Oh, by the way, I'm an assembly language programmer and can run circles
> 
> around any of the C programming kids.
> 
> 
> 
> Any help would be greatly appreciated.
> 
> 
> 
> Rich
> 
> 
>