42.8.8 Keyword

Name:	KEYWORD
Offset:	0x0C + n*0x04 [n=0..7]
Reset:	0x00000000
Property:	PAC Write-Protection


Bit	31	30	29	28	27	26	25	24
	KEYWORD[31:24]
Access	W	W	W	W	W	W	W	W
Reset	0	0	0	0	0	0	0	0


Bit	23	22	21	20	19	18	17	16
	KEYWORD[23:16]
Access	W	W	W	W	W	W	W	W
Reset	0	0	0	0	0	0	0	0


Bit	15	14	13	12	11	10	9	8
	KEYWORD[15:8]
Access	W	W	W	W	W	W	W	W
Reset	0	0	0	0	0	0	0	0


Bit	7	6	5	4	3	2	1	0
	KEYWORD[7:0]
Access	W	W	W	W	W	W	W	W
Reset	0	0	0	0	0	0	0	0

Bits 31:0 – KEYWORD[31:0] Key Word Value

The four/six/eight 32-bit Key Word registers set the 128-bit/192-bit/256-bit cryptographic key used for encryption/decryption. KEYWORD0.KEYWORD corresponds to the first word of the key and KEYWORD3/KEYWORD5/KEYWORD7.KEYWORD to the last one.

Note: By setting the XORKEY bit of CTRLA register, keyword will update with the resulting XOR value of user keyword and previous keyword content.