Datasheet

280
11011B–ATARM–21-Feb-12
SAM3N
Figure 18-5. Command State Chart
18.3.3.1 Getting Embedded Flash Descriptor
This command allows the system to learn about the Flash organization. The system can take full
advantage of this information. For instance, a device could be replaced by one with more Flash
capacity, and so the software is able to adapt itself to the new configuration.
To get the embedded Flash descriptor, the application writes the GETD command in the
EEFC_FCR register. The first word of the descriptor can be read by the software application in
the EEFC_FRR register as soon as the FRDY flag in the EEFC_FSR register rises. The next
reads of the EEFC_FRR register provide the following word of the descriptor. If extra read oper-
Check if FRDY flag Set
No
Yes
Read Status: MC_FSR
Write FCMD and PAGENB in Flash Command Register
Check if FLOCKE flag Set
Check if FRDY flag Set
No
Read Status: MC_FSR
Yes
Yes
Locking region violation
No
Check if FCMDE flag Set
Yes
No
Bad keyword violation
Command Successfull