ATxmega64A4U Atmel Corporation, ATxmega64A4U Datasheet - Page 325
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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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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