59.5.7 AESB Key Word Register x

Name: AESB_KEYWRx
Offset: 0x20 + x*0x04 [x=0..3]
Reset: –
Property: Write-only

Bit 3130292827262524 
 KEYW[31:24] 
Access WWWWWWWW 
Reset 00000000 
Bit 2322212019181716 
 KEYW[23:16] 
Access WWWWWWWW 
Reset 00000000 
Bit 15141312111098 
 KEYW[15:8] 
Access WWWWWWWW 
Reset 00000000 
Bit 76543210 
 KEYW[7:0] 
Access WWWWWWWW 
Reset 0000000– 

Bits 31:0 – KEYW[31:0] Key Word

The four 32-bit Key Word registers set the 128-bit cryptographic key used for encryption/decryption.

AESB_KEYWR0 corresponds to the first word of the key, AESB_KEYWR3 to the last one.

These registers are write-only to prevent the key from being read by another application.