AES key register 4
KEY | Cryptographic key, bits [159:128] Refer to the AES_KEYR0 register for description of the KEY[255:0] bitfield. Writing to this register has no effect when key size is 128-bit (KEYSIZE=0). When KEYVALID is set in AES_SR a write to this register clears KEYVALID if EN is cleared in AES_CR. |