Hi,

I'm hoping that someone who has had some experience with Atmel AT89S8253 eeprom programming & organisation can help. I have several questions, none of which seem to be clarified by any of the data sheets I can find, but here's the most fundamental...

When I use my parallel programmer (Needhams EMP-11) I can't access the 2K byte eeprom (although I can access a 64 byte area called the User Row). So how on earth can I program it - or can I only do that programatically?

Is the User Row part of the eeprom?

Is it just my programmer that won't read the eeprom, or any programmer?

If I set the lock bits does it also prevent the eeprom being read by a programmer as well as the rom?

I'm trying to implement a time-limited device a la this thread

http://www.8052.com/forumchat...ead=136035

but I don't really understand how to prevent someone just overwriting my count in a parallel programmer...

Thanks in advance.

Rob.