ATxmega256A3B Atmel Corporation, ATxmega256A3B Datasheet - Page 22

• Manufacturer Part Number: ATxmega256A3B
• Manufacturer: Atmel Corporation

Specifications of ATxmega256A3B

• 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: 47
• Ext Interrupts: 49
• Usb Speed: No
• Usb Interface: No
• Spi: 8
• Twi (i2c): 2
• Uart: 6
• 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

4.5
4.6
8077H–AVR–12/09
Data Memory
Internal SRAM
The Data memory contains the I/O Memory, internal SRAM, optionally memory mapped
EEPROM and external memory if available. The data memory is organized as one continuous
memory section, as shown in
Figure 4-2.
I/O Memory, EEPROM and SRAM will always have the same start addresses for all XMEGA
devices. External Memory (if exist) will always start at the end of Internal SRAM and end at
address 0xFFFFFF.
The internal SRAM is mapped in the Data Memory space, always starting at hexadecimal
address location 0x2000. SRAM is accessed from the CPU by using the load (LD/LDS/LDD) and
store (ST/STS/STD) instructions.
Data Memory Map
Figure 4-2 on page
0xFFFFFF
Start/End
0x000000
0x001000
0x002000
Address
External Memory
Internal SRAM
Data Memory
I/O Memory
EEPROM
(Up to 4 KB)
(Up to 4 KB)
(0 to 16 MB)
22.
XMEGA A
22