Problem beim Schreiben eines SPI EEPROM AT25080

>16 Byte Daten senden

vieleicht hier?

"the at25080 is capable of a 32-byte page write operation"

bei Atmel leider kein Codebeispiel, aber das hier im FAQ Bereech.:


What is the sequence in writing to the SPI devices?
Answer:   For writing to the Status Register:
Write enable Instruction (WREN) command, toggle CS, Write Status 
Register (WRSR) command.

For writing to the Memory:
Write Enable Instruction (WREN) command, toggle CS, WRITE command.


und das hier:


SPI: Write Operation:
Enable device via chip select low
Send write enable op code
Disable device via chip select high
Enable device via chip select low
Send write op code with address
Send data byte(s) for byte write or page write
Disable device via chip select high to start write cycle

Read Operation:
Enable device via chip select low
Send read op code with address
Receive data byte(s)
Disable device via chip select high

vielleicht hift es Euch mal

Nachtrag:

das Wichtigste zuletzt. Ich "Richtiger" Hinweis im Datenblatt wäre 
wirklich schön gewesen. wer das nicht weis, sucht ewig !!

Question:    I replaced one of your competitor's SPI Serial EEPROM 
devices with a compatible Atmel SPI device and it does not appear to 
perform a Write operation correctly. What is the solution?

Answer:   There is one minor difference in the activation and 
deactivation of Chip Select (CS) for Atmel's SPI devices that you should 
be aware of. Our SPI devices require that CS must be activated and 
deactivated during the same clock idle state (clock rest state). This 
means that if your clock idle state is low (mode 0) as defined by 
Motorola, then any CS transitions must occur when the clock is low. If 
your clock idle state is high (mode 3), then any CS transitions must 
occur when clock is high. This is a very important CS convention that 
must be observed because our device will not initiate the internal write 
cycle if not observed. For more information, please see the device 
datasheet.