ATxmega256A3U Atmel Corporation, ATxmega256A3U Datasheet - Page 325
ATxmega256A3U
Manufacturer Part Number
ATxmega256A3U
Description
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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATxmega256A3U-AU
Manufacturer:
TI
Quantity:
12 000
Part Number:
ATxmega256A3U-AU
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
Company:
Part Number:
ATxmega256A3U-MH
Manufacturer:
PANASONIC
Quantity:
1 450
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26.3
26.4
8331A–AVR–07/11
Operation
CRC on Flash memory
The data source for the CRC module must be selected in software as either flash memory, the
DMA channels, or the I/O interface. The CRC module then takes data input from the selected
source and generates a checksum based on these data. The checksum is available in the
CHECKSUM registers in the CRC module.
For the I/O interface or DMA controller, which CRC polynomial is used is software selectable.
The default setting is CRC-16. For CRC with flash memory, only CRC-32 can be used. The CRC
module operates on bytes only.
Figure 26-1. CRC generator block diagram.
A CRC-32 calculation can be performed on the entire flash memory, on only the application sec-
tion, on only the boot section, or on a software selectable range of the flash memory. Other than
selecting the flash as the source, all further control and setup are done from the NVM controller.
This means that the NVM controller configures the memory range to perform the CRC on, and
the CRC is started using NVM commands. Once completed, the result is available in the check-
sum registers in the CRC module. For further details on setting up and performing CRC on flash
memory, refer to
”Memory Programming” on page
DATAIN
CTRL
8
CRC-16
1
6
CHECKSUM
Controller
427.
DMA
Atmel AVR XMEGA AU
8
CRC-32
Memory
Flash
3
2
325
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