User Manual

134

8111A–AVR–05/08

AT86RF231

• Bit [6:1] -Reserved

•Bit 0 - AES_RY

This register controls the operation of the security module. Do not access this register during

AES operation to read the AES core status. A read or write access during AES operation stops

the actual processing.

To read the AES status use register bit AES_RY (register 0x82, AES_ST).

• Bit 7 - AES_REQUEST

A write access with AES_REQUEST = 1 initiates the AES operation.

• Bit [6:4] - AES_MODE

This register bit sets the AES operation mode.

Table 11-3. AES Core Operation Status

AES_ER 0

No error of the AES module

1 AES module error

Table 11-4. AES Core Operation Status

AES_RY 0

AES Module is not finished

1 AES module has finished

Bit 7 6 5 4 3 2 1 0

+0x83 AES_REQUEST AES_MODE AES_DIR Reserved AES_CON

Read/Write W R/W R/W R/W R/W R R R

Reset Value 0 0 0 0 0 0 0 0

Table 11-5. AES Core Status

AES_REQUEST 0

Security module, AES core idle

1 Write access: Start security module

Table 11-6. AES Mode

AES_MODE 0

ECB mode, refer to Section 11.1.4.1

1 KEY mode, refer to Section 11.1.3

2 CBC mode, refer to Section 11.1.4.2

3 - 7 Reserved