ATxmega256A3U Atmel Corporation, ATxmega256A3U Datasheet - Page 35

• 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

8331A–AVR–07/11
Table 4-10.
• Bit 3:2 – BLBAT[1:0]: Boot Lock Bit Application Table Section
These lock bits control the security level for the application table section. The BLBAT bits can
only be written to a more strict locking. Resetting the BLBAT bits is possible by executing a chip
erase command.
Table 4-11.
BLBAT[1:0]
BLBA[1:0]
11
10
01
00
11
10
01
00
Boot lock bit for the application section.
Boot lock bit for the application table section.
Group Configuration
Group Configuration
RWLOCK
RWLOCK
NOLOCK
NOLOCK
WLOCK
WLOCK
RLOCK
RLOCK
Description
No Lock - no restrictions for SPM and (E)LPM
accessing the application section.
Write lock – SPM is not allowed to write the application
section.
Read lock – (E)LPM executing from the boot loader
section is not allowed to read from the application
section.
If the interrupt vectors are placed in the boot loader
section, interrupts are disabled while executing from the
application section.
Read and write lock – SPM is not allowed to write to the
application section, and (E)LPM executing from the boot
loader section is not allowed to read from the
application section.
If the interrupt vectors are placed in the boot loader
section, interrupts are disabled while executing from the
application section.
Description
No lock – no restrictions for SPM and (E)LPM accessing
the application table section.
Write lock – SPM is not allowed to write the application
table
Read lock – (E)LPM executing from the boot loader
section is not allowed to read from the application table
section.
If the interrupt vectors are placed in the boot loader
section, interrupts are disabled while executing from the
application section.
Read and write lock – SPM is not allowed to write to the
application table section, and (E)LPM executing from
the boot loader section is not allowed to read from the
application table section.
If the interrupt vectors are placed in the boot loader
section, interrupts are disabled while executing from the
application section.
Atmel AVR XMEGA AU
35