Bit 13 – KEYGEN: Key Generation
Value
Description
0
No effect
1
Start Computation of the last NK words of the expanded key
Bit 12 – LOD: Last Output Data Mode
Value
Description
0
No effect
1
Start encryption in Last Output Data mode
Bit 11 – STARTMODE: Start Mode Select
Value
Name
Description
0
Manual Mode
Start Encryption / Decryption in Manual mode
1
Auto Mode
Start Encryption / Decryption in Auto mode
Bit 10 – CIPHER: Encryption/ Decryption
Value
Description
0
Decryption
1
Encryption
Bits 9:8 – KEYSIZE[1:0]: Encryption Key Size
Value
Name
Description
0
128-bit Key
128-bit Key for Encryption / Decryption
1
192-bit Key
192-bit Key for Encryption / Decryption
2
256-bit Key
256-bit Key for Encryption / Decryption
3
Reserved
Reserved
Bits 7:5 – CFBS[2:0]: Cipher Feedback Block Size
Value
Name
Description
0
128-bit data block 128-bit Input data block for Encryption/Decryption in Cipher Feedback
mode
1
64-bit data block
64-bit Input data block for Encryption/Decryption in Cipher Feedback
mode
2
32-bit data block
32-bit Input data block for Encryption/Decryption in Cipher Feedback
mode
3
16-bit data block
16-bit Input data block for Encryption/Decryption in Cipher Feedback
mode
4
8-bit data block
8-bit Input data block for Encryption/Decryption in Cipher Feedback mode
Atmel SAM L22G / L22J / L22N [DATASHEET]
Atmel-42402E-SAM L22G / L22J / L22N_Datasheet_Complete-07/2016
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