ATxmega256A3U Atmel Corporation, ATxmega256A3U Datasheet - Page 20

• Manufacturer Part Number: ATxmega256A3U
• Manufacturer: Atmel Corporation

Specifications of ATxmega256A3U

• Flash (kbytes): 256 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): 16
• Eeprom (bytes): 4096
• 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

4.3
8331A–AVR–07/11
Flash Program Memory
(NVM) spaces can be locked for further write and read/write operations. This prevents unre-
stricted access to the application software.
A separate memory section contains the fuse bytes. These are used for configuring important
system functions, and can only be written by an external programmer.
The XMEGA AU devices contains on-chip in-system reprogrammable flash memory for program
storage. The flash memory can be accessed for read and write from an external programmer
through the PDI or from application software running in the device.
All AVR CPU instructions are 16 or 32 bit wide, and each flash location is 16 bits wide. The flash
memory is organized in two main sections, the application section and the boot loader section,
as shown in
dependent. These two sections have separate lock bits, and can have different levels of protec-
tion. The store program memory (SPM) instruction,used to write to the flash from the application
software, will only operate when executed from the boot loader section.
The application section contains an application table section with separate lock settings. This
enables safe storage of nonvolatile data in the program memory.
Figure 4-1.
Figure 4-1 on page
Flash memory sections.
20. The sizes of the different sections are fixed, but device-
Atmel AVR XMEGA AU
20