Atmel ARM-Based Evaluation Kit for SAM4S16C, 32-Bit ARM® Cortex® Microcontroller ATSAM4S-WPIR-RD ATSAM4S-WPIR-RD Data Sheet

SAM4S Series [DATASHEET]

Atmel-11100G-ATARM-SAM4S-Datasheet_27-May-14

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The EEFC offers a set of commands to manage programming the Flash memory, locking and unlocking lock 

regions, consecutive programming, locking and full Flash erasing, etc. 

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.

Get Flash descriptor

0x00

GETD

Write page

0x01

WP

Write page and lock

0x02

WPL

Erase page and write page

0x03

EWP

Erase page and write page then lock

0x04

EWPL

Erase all

0x05

EA

Erase pages

0x07

EPA

Set lock bit

0x08

SLB

Clear lock bit

0x09

CLB

Get lock bit

0x0A

GLB

Set GPNVM bit

0x0B

SGPB

Clear GPNVM bit

0x0C

CGPB

Get GPNVM bit

0x0D

GGPB

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