ATxmega128A3U Atmel Corporation, ATxmega128A3U Datasheet - Page 317
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ATxmega128A3U
Manufacturer Part Number
ATxmega128A3U
Description
Manufacturer
Atmel Corporation
Specifications of ATxmega128A3U
Flash (kbytes)
128 Kbytes
Pin Count
64
Max. Operating Frequency
32 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
Hardware Qtouch Acquisition
No
Max I/o Pins
50
Ext Interrupts
50
Usb Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device
Spi
10
Twi (i2c)
2
Uart
7
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
16
Adc Resolution (bits)
12
Adc Speed (ksps)
2000
Analog Comparators
4
Resistive Touch Screen
No
Dac Channels
2
Dac Resolution (bits)
12
Temp. Sensor
Yes
Crypto Engine
AES/DES
Sram (kbytes)
8
Eeprom (bytes)
2048
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
Yes
Temp. Range (deg C)
-40 to 85
I/o Supply Class
1.6 to 3.6
Operating Voltage (vcc)
1.6 to 3.6
Fpu
No
Mpu / Mmu
no / no
Timers
7
Output Compare Channels
22
Input Capture Channels
22
Pwm Channels
22
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATxmega128A3U-AU
Manufacturer:
ATMEL
Quantity:
39
Company:
Part Number:
ATxmega128A3U-MH
Manufacturer:
ATMEL
Quantity:
1
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25.4
8331A–AVR–07/11
AES Crypto Module
Figure 25-1. Register file usage during DES encryption/decryption.
Executing one DES instruction performs one round in the DES algorithm. Sixteen rounds must
be executed in increasing order to form the correct DES ciphertext or plaintext. Intermediate
results are stored in the register file (R0-R15) after each DES instruction. After sixteen rounds,
the key is located in R8-R16 and the encrypted/decrypted ciphertext/plaintext is located in R0-
R7. The instruction's operand (K) determines which round is executed, and the half carry flag (H)
in the CPU status register determines whether encryption or decryption is performed. If the half
carry flag is set, decryption is performed, and if the flag is cleared, encryption is performed.
For more details on the DES instruction, refer to the AVR instruction set manual.
The AES crypto module performs encryption and decryption according to the Advanced Encryp-
tion Standard (FIPS-197). The 128-bit key block and 128-bit data block (plaintext or ciphertext)
must be loaded into the key and state memories in the AES crypto module. This is done by writ-
ing the AES KEY register and STATE register sequentially with 16 bytes.
It is software selectable whether the module should perform encryption or decryption. It is also
possible to enable XOR mode, where all new data loaded to the state key is XORed with the cur-
rent data in the state memory.
The AES module uses 375 clock cycles before the encrypted/decrypted plaintext/ciphertext is
available for readout in the state memory.
Register File
R10
R11
R12
R13
R14
R15
R16
R31
R0
R1
R2
R3
R4
R5
R6
R7
R8
R9
...
Atmel AVR XMEGA AU
data0
data1
data2
data3
data4
data5
data6
data7
key0
key1
key2
key3
key4
key5
key6
key7
317
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