SAM3S8C Atmel Corporation, SAM3S8C Datasheet - Page 310

• Manufacturer Part Number: SAM3S8C
• Manufacturer: Atmel Corporation

18.4.3.7
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SAM3S8/SD8
SAM3S8/SD8
Unique Identifier
Disabling the security bit can only be achieved by asserting the ERASE pin at 1, and after a full
Flash erase is performed. When the security bit is deactivated, all accesses to the Flash are
permitted.
Each part is programmed with a 128-bit Unique Identifier. It can be used to generate keys for
example. For the SAM3SD8, the unique ID is accessible on both memory planes.
To read the Unique Identifier the sequence is:
Note that during the sequence, the software can not run out of Flash (or the second plane in
case of dual plane).
• Send the Start Read unique Identifier command (STUI) by writing the Flash Command
• When the Unique Identifier is ready to be read, the FRDY bit in the Flash Programming
• The Unique Identifier is located in the first 128 bits of the Flash memory mapping, thus, at the
• To stop the Unique Identifier mode, the user needs to send the Stop Read unique Identifier
• When the Stop read Unique Identifier command (SPUI) has been performed, the FRDY bit in
Register with the STUI command.
Status Register (EEFC_FSR) falls.
address
command (SPUI) by writing the Flash Command Register with the SPUI command.
the Flash Programming Status Register (EEFC_FSR) rises. If an interrupt was enabled by
setting the FRDY bit in EEFC_FMR, the interrupt line of the NVIC is activated.
0x40000-0x4000F
.
11090A–ATARM–10-Feb-12
11090A–ATARM–10-Feb-12