DATA command not working properly

[khufumen]

I have a 16F876 with onboard EEPROM. If I write the following commands

MyByte VAR Byte
DATA @0, 12
READ 0, MyByte

I get 255 for the value of MyByte. However, if I write the following code:

MyByte VAR Byte
WRITE 0, 12
READ 0, MyByte

I get 12 for the value of MyByte. It seems that the DATA command is not loading the EEPROM when the program is downloaded.

Does anyone have any thoughts on this? I could sure use the help.

Thanks,

Eric

[mister_e]

No problem here, can be programmer setting problem. Wich programmer do you use?

[khufumen]

I am using melabs serial programmer.

Is there anything in the configuration file I need to change?

[mister_e]

mmm, not familiar with those Melabs... Bruce is certainely the guy for that but, is there any setting in your Melabs Programmer to permit/void to fill eeprom data with the current program data??? Can you access directly to EEPROM within Melabs Program?

[Bruce]

With the MeLabs serial programmer, make sure you have it set to program data EEPROM before programming.

Under Options >> More Options >> Program -- make sure you have a check mark by Data.

DATA will only place values in EEPROM at program time. WRITE does it at run time.

[khufumen]

Bruce,

You hit the nail on the head!!! Your comments fixed my problem. I was at my wits end and had tried just about every option except the one you suggested. I must say, the help menu for the melabs programmer was not a big help in solving this problem.

Thanks for your help.

Kind Regards,
Eric