Atmel Xplained Evaluation Board AT32UC3A3-XPLD AT32UC3A3-XPLD Data Sheet

32072H–AVR32–10/2012

Name: MR

Access Type: Read/Write

0x04

0x00000000

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

7

6

5

4

3

2

1

0

PROCDLY

-

-

-

CIPHER

X

X

X

X

0

Countermeasure  type  1  is  disabled

X

X

X

X

1

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

0

X

X

X

X

Countermeasure  type  5  is  disabled

1

X

X

X

X

Add random spurious power consumption during processing 
(recommended with DMA access)