Atmel ARM-Based Evaluation Kit AT91SAM9N12-EK AT91SAM9N12-EK Data Sheet

1013

SAM9N12/SAM9CN11/SAM9CN12 [DATASHEET]

11063K–ATARM–05-Nov-13

Values which are not listed in the table must be considered as “reserved”.

For CBC-MAC operating mode, please set OPMOD to CBC and LOD to 1.

0: No effect.

After each end of encryption/decryption, the output data are available either on the output data registers (Manual and Auto 
modes) or at the address specified in the Channel Buffer Transfer Descriptor for DMA mode. 

In Manual and Auto modes, the DATRDY flag is cleared when at least one of the Output Data registers is read.

1: The DATRDY flag is cleared when at least one of the Input Data Registers is written.

No more Output Data Register reads is necessary between consecutive encryptions/decryptions (see 

).

Warning: In DMA mode, reading 

to the Output Data 

registers before the last data encryption/decryption process may lead to unpre-

dictable results.

Values which are not listed in table must be considered as “reserved”.

0x0

ECB

ECB: Electronic Code Book mode

0x1

CBC

CBC: Cipher Block Chaining mode

0x2

OFB

OFB: Output Feedback mode

0x3

CFB

CFB: Cipher Feedback mode

0x4

CTR

CTR: Counter mode (16-bit internal counter)

0x0

SIZE_128BIT

128-bit

0x1

SIZE_64BIT

64-bit

0x2

SIZE_32BIT

32-bit

0x3

SIZE_16BIT

16-bit

0x4

SIZE_8BIT

8-bit

0xE

PASSWD

This field must be written with 0xE the first time that AES_MR is programmed. For subsequent 
programming of the AES_MR, any value can be written, including that of 0xE.

Always reads as 0.