There is code in the PICList archive for DataFlash.

That said, I found the DataFlash interface to be a PITN.  I didn't actually
use it, because I'm finding Atmel's serial flash interface easier to cope
with.

Unfortunately, serial flash isn't available in very high bit densities
(yet), nor
in 5V models.  If you don't need a higher bit density, it may be worth a
look.

Mike H.

>Hi,
>
>is anyone know where can I find the source (prefer in assembly) for
>communicate a PIC(hardware SPI) with Atmel DataFlash. AT45DB041B?
>
>Thanks in advance.
>
>WH Tan
>
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