ATxmega256A3 Atmel Corporation, ATxmega256A3 Datasheet - Page 32

• Manufacturer Part Number: ATxmega256A3
• Manufacturer: Atmel Corporation

Specifications of ATxmega256A3

• 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 Speed: No
• Usb Interface: No
• 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
8077H–AVR–12/09
FUSEBYTE5 - Non-Volatile Memory Fuse Byte 5
Table 4-3.
• Bit 1 - WDLOCK: Watchdog Timer lock
The WDLOCK fuse can be programmed to lock the Watchdog Timer configuration. When this
fuse is programmed the Watchdog Timer configuration cannot be changed, and the Watchdog
Timer cannot be disabled from the application software. When this fuse is programmed the
ENABLE bit in the watchdog CTRL register is automatically set at reset. The WEN bit in the
watchdog WINCTRL register is not set automatically and needs to be enabled from software.
Table 4-4.
• Bit 0 - JTAGEN: JTAG enabled
The JTAGEN fuse decides whether or not the JTAG interface is enabled.
When the JTAG interface is disabled all access through JTAG is prohibited, and the device can
only be accessed using the Program and Debug Interface (PDI).
Table 4-5.
The JTAGEN fuse is only available on devices with JTAG interface.
• 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
+0x05
Read/Write
Initial Value
STARTUPTIME[1:0]
WDLOCK
JTAGEN
00
01
10
11
0
1
0
1
Start-up Time
Watchdog Timer locking
JTAG Enable
R/W
7
1
-
Description
Watchdog Timer locked for modifications
Watchdog Timer not locked
Description
JTAG enabled
JTAG disabled
R/W
6
1
-
R
5
BODACT[1:0]
-
4
R
-
1kHz ULP oscillator Cycles
EESAVE
R/W
3
-
Reserved
64
4
0
R/W
2
-
BODLEVEL[2:0]
R/W
1
-
XMEGA A
R/W
0
-
FUSEBYTE5
32