ATxmega256A3 Atmel Corporation, ATxmega256A3 Datasheet - Page 102
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ATxmega256A3
Manufacturer Part Number
ATxmega256A3
Description
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
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9. Reset System
9.1
9.2
8077H–AVR–12/09
Features
Overview
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•
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•
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The Reset System will issue a system reset and set the device to its initial state if a reset source
goes active. All IO registers will be set to their initial value, and the program counter is reset to
the Reset Vector location. The reset controller is asynchronous, hence no running clock is
required to reset the device.
XMEGA has seven different reset sources. If more than one reset source is active, the device
will be kept in reset until all reset sources have released their reset. After reset is released from
all reset sources, the default oscillator is started and calibrated before the internal reset is
released and the device starts running.
The reset system has a status register with individual flags for each reset source. The Status
register is cleared at Power-on Reset, hence this register will show which source(s) that has
issued a reset since the last power-on. A software reset feature makes it possible to issue a sys-
tem reset from the user software.
An overview of the reset system is shown in
Power-on reset source
Brown-out reset source
Software reset source
External reset source
Watchdog reset source
Program and Debug Interface reset source
Figure 9-1 on page
103.
XMEGA A
102