ATMEGA128RFA1-ZU Atmel, ATMEGA128RFA1-ZU Datasheet - Page 94

• Manufacturer Part Number: ATMEGA128RFA1-ZU
• Description: IC AVR MCU 2.4GHZ XCEIVER 64QFN
• Manufacturer: Atmel
• Series: ATMEGAr

Specifications of ATMEGA128RFA1-ZU

• Frequency: 2.4GHz
• Data Rate - Maximum: 2Mbps
• Modulation Or Protocol: 802.15.4 Zigbee
• Applications: General Purpose
• Power - Output: 3.5dBm
• Sensitivity: -100dBm
• Voltage - Supply: 1.8 V ~ 3.6 V
• Current - Receiving: 12.5mA
• Current - Transmitting: 14.5mA
• Data Interface: PCB, Surface Mount
• Memory Size: 128kB Flash, 4kB EEPROM, 16kB RAM
• Antenna Connector: PCB, Surface Mount
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-VFQFN, Exposed Pad
• Rf Ic Case Style: QFN
• No. Of Pins: 64
• Supply Voltage Range: 1.8V To 3.6V
• Operating Temperature Range: -40°C To +85°C
• Svhc: No SVHC (15-Dec-2010)
• Rohs Compliant: Yes
• Processor Series: ATMEGA128x
• Core: AVR8
• Data Bus Width: 8 bit
• Program Memory Type: Flash
• Program Memory Size: 128 KB
• Data Ram Size: 16 KB
• Interface Type: JTAG
• Maximum Clock Frequency: 16 MHz
• Number Of Programmable I/os: 38
• Number Of Timers: 6
• Operating Supply Voltage: 1.8 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVR128RFA1-EK1
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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ATmega128RFA1
Table 9-25. AES Engine Configuration Steps
Before starting any security operation a 16 Byte key must be written to the security
engine (refer to section
consecutive write accesses to the I/O register AES_KEY. An internal address counter is
incremented automatically with every read/ write operation. An AES encryption/
decryption run resets the internal byte counter. If the key and data buffer has not been
read or written completely (all 16 Bytes), the following encryption/ decryption operation
will finish with an error.
The following step selects either Electronic Code Book (ECB) or Cipher Block Chaining
(CBC) as the AES_MODE. These modes are explained in more detail in section
"Security Operation Modes" on
selected with bit AES_DIR of register AES_CTRL.
If the AES Error or AES Ready IRQ is used, the interrupt must be enabled with bit
AES_IM.
Next the 128-bit plain text or cipher text data has to be provided to the AES hardware
engine. The 16 data bytes must be consecutively written to the AES_STATE register.
The AES_STATE register can be accessed in the same way as the key register (refer to
"Security Key Setup" on
The encryption or decryption is initiated with bit AES_REQUEST = 1.
The operation takes 24 µs and the completed encryption/ decryption is indicated by the
AES_READY IRQ and the AES_DONE bit. The internal byte counter of the key and
data buffer is cleared and the resulting data can be read out.
For additional information about the key and data buffer please refer to section
"AES_KEY – AES Encryption and Decryption Key Buffer Register" on page 103
"AES_STATE – AES Plain and Cipher Text Buffer Register" on page 103.
Notes:
Step
1
2
3
4
5
6
Description
Key Setup
AES configuration
Write Data
Start operation
Wait for AES finished:
1. AES_READY IRQ or
2. polling AES_DONE bit
3. wait for 24 µs
Read Data
1. Access to the security block is not possible while the radio transceiver is in state
2. All configurations of the security module, the SRAM content and keys are reset
(register AES_STATUS) or
SLEEP.
during SLEEP or RESET states.
page 95).
"Security Key Setup" on
page 95. Encryption or decryption must be further
Description
Write encryption or decryption key to KEY
buffer
(16 consecutive byte writes to AES_KEY)
Select AES mode: ECB or CBC
Select encryption or decryption
Enable the AES Encryption Ready Interrupt
AES_READY
Write plaintext or cipher text to DATA buffer
(16 consecutive byte writes to AES_STATE)
Start AES operation
Wait until AES encryption/decryption is
finished successfully
Read cipher text or plaintext from DATA buffer
(16 consecutive byte reads from AES_STATE)
page 95). This can be done by 16
8266B-MCU Wireless-03/11
and