ATxmega128A4U Atmel Corporation, ATxmega128A4U Datasheet - Page 324
ATxmega128A4U
Manufacturer Part Number
ATxmega128A4U
Description
Manufacturer
Atmel Corporation
Specifications of ATxmega128A4U
Flash (kbytes)
128 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
7
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)
8
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:
ATxmega128A4U-CU
Manufacturer:
ATMEL
Quantity:
1 000
Company:
Part Number:
ATxmega128A4U-MH
Manufacturer:
JAE
Quantity:
3 000
Part Number:
ATxmega128A4U-U
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
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26. CRC - Cyclic Redundancy Check
26.1
26.2
8331A–AVR–07/11
Features
Overview
•
•
•
•
A cyclic redundancy check (CRC) is an error detection technique test algorithm used to find
accidental errors in data, and it is commonly used to determine the correctness of a data trans-
mission, and data present in the data and program memories. A CRC takes a data stream or a
block of data as input and generates a 16- or 32-bit output that can be appended to the data and
used as a checksum. When the same data are later received or read, the device or application
repeats the calculation. If the new CRC result does not match the one calculated earlier, the
block contains a data error. The application will then detect this and may take a corrective
action, such as requesting the data to be sent again or simply not using the incorrect data.
Typically, an n-bit CRC applied to a data block of arbitrary length will detect any single error
burst not longer than n bits (any single alteration that spans no more than n bits of the data), and
will detect the fraction 1-2
ports two commonly used CRC polynomials; CRC-16 (CRC-CCITT) and CRC-32 (IEEE 802.3).
• CRC-16:
• CRC-32:
Cyclic redundancy check (CRC) generation and checking for
Integrated with flash memory, DMA controller and CPU
CRC polynomial software selectable to
Zero remainder detection
– Communication data
– Program or data in flash memory
– Data in SRAM and I/O memory space
– Continuous CRC on data going through a DMA channel
– Automatic CRC of the complete or a selectable range of the flash memory
– CPU can load data to the CRC generator through the I/O interface
– CRC-16 (CRC-CCITT)
– CRC-32 (IEEE 802.3)
Hex value:
Hex value:
Polynomial:
Polnomial:
x
0x1021
x
0x04C11DB7
16
32
-n
+x
+x
of all longer error bursts. The CRC module in XMEGA devices sup-
12
26
+x
+x
5
23
+1
+x
22
+x
16
+x
12
+x
11
Atmel AVR XMEGA AU
+x
10
+
x
8
+x
7
+x
5
+x
4
+x
2
+x+1
324
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