Datasheet

297
SAM3X / SAM3A [DATASHEET]
Atmel-11057C-ATARM-SAM3X-SAM3A-Datasheet_23-Mar-15
Figure 18-5. Command State Chart
18.4.3.1 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 operations to the EEFC_FRR register are done after the last word of the descriptor
has been returned, then the EEFC_FRR register value is 0 until the next valid command.
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