52.6.7 TZAESB Key Word Register x
This register can only be written if WPEN is cleared in the TZAESB Write Protection Mode Register.
| Name: | TZAESB_KEYWRx |
| Offset: | 0x20 + x*0x04 [x=0..3] |
| Reset: | – |
| Property: | Write-only |
| Bit | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | |
| KEYW[31:24] | |||||||||
| Access | W | W | W | W | W | W | W | W | |
| Reset | – | – | – | – | – | – | – | – | |
| Bit | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | |
| KEYW[23:16] | |||||||||
| Access | W | W | W | W | W | W | W | W | |
| Reset | – | – | – | – | – | – | – | – | |
| Bit | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | |
| KEYW[15:8] | |||||||||
| Access | W | W | W | W | W | W | W | W | |
| Reset | – | – | – | – | – | – | – | – | |
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| KEYW[7:0] | |||||||||
| Access | W | W | W | W | W | W | W | W | |
| Reset | – | – | – | – | – | – | – | – | |
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.
TZAESB_KEYWR0 corresponds to the first word of the key, TZAESB_KEYWR3 to the last one.
These registers are write-only to prevent the key from being read by another application.