ATxmega256A3U Atmel Corporation, ATxmega256A3U Datasheet - Page 33

• 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

4.16.5
8331A–AVR–07/11
FUSEBYTE5 – Nonolatile Memory Fuse Byte 5
• Bit 7:6 – Reserved
These bits are reserved. For compatibility with future devices, always write these bits to one
when this register is written.
• Bit 5:4 – BODACT[1:0]: BOD Operation in Active Mode
These fuse bits set the BOD operation mode when the device is in active and idle mode. For
details on the BOD and BOD operation modes refer to
Table 4-7.
• Bit 3 – EESAVE: EEPROM is Preserved through the Chip Erase
A chip erase command will normally erase the flash, EEPROM and internal SRAM. If this fuse is
programmed, the EEPROM is not erased during chip erase. This is useful if EEPROM is used to
store data independent of software revision.
Table 4-8.
Changes to the EESAVE fuse bit take effect immediately after the write timeout elapses. Hence,
it is possible to update EESAVE and perform a chip erase according to the new setting of
EESAVE without leaving and reentering programming mode.
• Bit 2:0 – BODLEVEL[2:0]: Brownout Detection Voltage Level
These fuse bits sets the BOD voltage level. During poweron the device is kept in reset until the
V
is set lower than the V
”Reset System” on page 111
114.
Bit
+0x05
Read/Write
Initial Value
CC
BODACT[1:0]
EESAVE
level has reached the programmed BOD level. Due to this always ensure that the BOD level
00
01
10
11
0
1
BOD operation modes in active and idle modes.
EEPROM preserved through chip erase
R/W
7
–
1
Description
Reserved
BOD enabled in sampled mode
BOD enabled continuously
BOD disabled
Description
EEPROM is preserved during chip erase
EEPROM is erased during chip erase
CC
R/W
6
–
1
level, if the BOD is not enabled used during normal operation, refer to
for details. For BOD level nominal values, see
R
5
BODACT[1:0]
–
4
R
–
EESAVE
R/W
3
–
Atmel AVR XMEGA AU
”Brownout Detection” on page
R/W
2
–
BODLEVEL[2:0]
R/W
1
–
Table 9-2 on page
R/W
0
–
113.
FUSEBYTE5
33