Atmel Evaluation Kit for the SAM4E Series of Flash Microcontrollers ATSAM4E-EK ATSAM4E-EK Data Sheet

SAM4E [DATASHEET]

Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14

400

In order to perform one of these commands, the Flash Command register (EEFC_FCR) must be written with the
correct command using the FCMD field. As soon as EEFC_FCR is written, the FRDY flag and the FVALUE field in
the Flash Result register (EEFC_FRR) are automatically cleared. Once the current command is achieved, then the
FRDY flag is automatically set. If an interrupt has been enabled by setting the FRDY bit in EEFC_FMR, the
corresponding interrupt line of the interrupt controller is activated. (Note that this is true for all commands except
for the STUI Command. The FRDY flag is not set when the STUI command is achieved.)

All the commands are protected by the same keyword, which must be written in the eight highest bits of
EEFC_FCR.

Writing EEFC_FCR with data that does not contain the correct key and/or with an invalid command has no effect
on the whole memory plane, but the FCMDE flag is set in the Flash Status register (EEFC_FSR). This flag is
automatically cleared by a read access to EEFC_FSR.

When the current command writes or erases a page in a locked region, the command has no effect on the whole
memory plane, but the FLOCKE flag is set in EEFC_FSR. This flag is automatically cleared by a read access to
EEFC_FSR.

Start read unique identifier

0x0E

STUI

Stop read unique identifier

0x0F

SPUI

Get CALIB bit

0x10

GCALB

Erase sector

0x11

ES

Write user signature

0x12

WUS

Erase user signature

0x13

EUS

Start read user signature

0x14

STUS

Stop read user signature

0x15

SPUS