ATxmega64A4U Atmel Corporation, ATxmega64A4U Datasheet - Page 115
ATxmega64A4U
Manufacturer Part Number
ATxmega64A4U
Description
Manufacturer
Atmel Corporation
Specifications of ATxmega64A4U
Flash (kbytes)
64 Kbytes
Pin Count
44
Max. Operating Frequency
32 MHz
Cpu
8-bit AVR
Hardware Qtouch Acquisition
No
Max I/o Pins
34
Ext Interrupts
34
Usb Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device
Spi
2
Twi (i2c)
2
Uart
5
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
12
Adc Resolution (bits)
12
Adc Speed (ksps)
2000
Analog Comparators
2
Resistive Touch Screen
No
Dac Channels
2
Dac Resolution (bits)
12
Temp. Sensor
Yes
Crypto Engine
AES/DES
Sram (kbytes)
4
Eeprom (bytes)
2048
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
5
Output Compare Channels
16
Input Capture Channels
16
Pwm Channels
16
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATxmega64A4U-AU
Manufacturer:
ON
Quantity:
29 000
Company:
Part Number:
ATxmega64A4U-U
Manufacturer:
ATMEL
Quantity:
74
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9.4.3
9.4.4
8331A–AVR–07/11
External Reset
Watchdog Reset
The BODACT fuse determines the BOD setting for active mode and idle mode, while the
BODPD fuse determines the brownout detection setting for all sleep modes, except idle mode.
Table 9-3.
The external reset circuit is connected to the external RESET pin. The external reset will trigger
when the RESET pin is driven below the RESET pin threshold voltage, V
minimum pulse period, t
includes an internal pull-up resistor.
Figure 9-5.
For external reset characterization data consult the device datasheet.
The watchdog timer (WDT) is a system function for monitoring correct program operation. If the
WDT is not reset from the software within a programmable timout period, a watchdog reset will
be given. The watchdog reset is active for one to two clock cycles of the 2MHz internal oscillator.
• Enabled: In this mode, the V
• Sampled: In this mode, the BOD circuit will sample the V
for a period of t
that of the 1kHz output from the ultra low power (ULP) internal oscillator. Between each
sample, the BOD is turned off. This mode will reduce the power consumption compared to
the enabled mode, but a fall in the V
oscillator output will not be detected. If a brownout is detected in this mode, the BOD circuit is
set in enabled mode to ensure that the device is kept in reset until V
CC
BOD setting fuse decoding.
External reset characteristics.
BOD
BODACT[1:0]/ BODPD[1:0]
will give a brownout reset
EXT
t
EXT
. The reset will be held as long as the pin is kept low. The RESET pin
CC
00
01
10
11
level is continuously monitored, and a drop in V
CC
level between two positive edges of the 1kHz ULP
Atmel AVR XMEGA AU
CC
level with a period identical to
CC
RST
is above V
, for longer than the
Reserved
Sampled
Disabled
Enabled
Mode
CC
below V
BOT
again
115
BOT
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