Datasheet

899
32072H–AVR32–10/2012
AT32UC3A3
33.5.2 Mode Register
Name:
MR
Access Type: Read/Write
Offset: 0x04
Reset Value: 0x00000000
• CTYPE: Countermeasure Type
All the countermeasures are enabled by default.
CTYPE field is write-only and can only be modified if CKEY is correctly set.
31 30 29 28 27 26 25 24
- - - CTYPE
23 22 21 20 19 18 17 16
CKEY - CFBS
15 14 13 12 11 10 9 8
LOD OPMOD KEYSIZE SMOD
76543210
PROCDLY - - - CIPHER
CTYPE Description
XXXX0Countermeasure type 1 is disabled
XXXX1
Add random spurious power consumption during some configuration
settings
X X X 0 X Countermeasure type 2 is disabled
X X X 1 X Add randomly 1 cycle to processing.
X X 0 X X Countermeasure type 3 is disabled
X X 1 X X Add randomly 1 cycle to processing (other version)
X 0 X X X Countermeasure type 4 is disabled
X 1 X X X Add randomly up to /13/15 cycles (for /192/256-bit key) to processing
0XXXXCountermeasure type 5 is disabled
1XXXX
Add random spurious power consumption during processing
(recommended with DMA access)