ATxmega256A3 Atmel Corporation, ATxmega256A3 Datasheet - Page 106

• 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

9.4.2
8077H–AVR–12/09
Brown-Out Detection
The Brown-Out Detection (BOD) circuit monitors that the V
trigger level, V
low the trigger level for a minimum time, t
above the trigger level again.
Figure 9-4.
For characterization data on t
by a programmable BODLEVEL setting, see
Table 9-2.
Notes:
The BOD circuit has 3 modes of operation:
• Disabled: In this mode there is no monitoring of the V
• Enabled: In this mode the V
recommended for applications where the power supply is stable.
for at least t
INTERNAL
TIME-OUT
1. The values here are nominal values only. For typical, maximum and minimum numbers consult
2.
RESET
Changing these fuse bits will have no effect until leaving programming mode.
the device data sheet.
V
BOT
CC
Brown-out Detection reset.
Programmable BODLEVEL setting
BOD
. When the BOD is enabled, a BOD reset will be given if the V
will give a brown-out reset.
BODLEVEL[2:0]
111
110
101
100
011
010
001
000
BOD
CC
consult the device data sheet. The trigger level is determined
level is continuously monitored, and a drop in V
(1)
V
BOT-
BOD
Table
t
. The reset is kept active until the V
BOD
9-2.
CC
CC
level, and hence it is only
level is kept above a configurable
V
t
V
TOUT
BOT+
1.6
1.8
2.0
2.2
2.4
2.7
2.9
3.2
BOT
XMEGA A
CC
CC
level falls bel-
CC
below V
UNIT
level rises
V
BOT
106