Datasheet
448
42023E–SAM–07/2013
ATSAM4L8/L4/L2
18.5.13 Parameter Register
Name:
Parameter
Access Type: Read-only
Offset: 0xF8
Reset Value: -
• CTRMEAS: Countermeasures
• OPMODE: Maximum Number of Confidentiality Modes of Operation
• KEYSIZE: Maximum Key Size
31 30 29 28 27 26 25 24
--------
23 22 21 20 19 18 17 16
--------
15 14 13 12 11 10 9 8
-------CTRMEAS
76543210
- - - OPMODE KEYSIZE
CTRMEAS Description
0 Countermeasures not implemented
1 Countermeasures implemented
OPMODE Description
0 ECB only
1 ECB and CBC only
2 ECB, CBC, and CFB only
3 ECB, CBC, CFB, and OFB only
4 ECB, CBC, CFB, OFB, and CTR
KEYSIZE Description
0 128-bit only
1 128- and 192-bit only
2 128-, 192-, and 256-bit only