參數(shù)資料
型號(hào): MR80C154-25P883D
廠商: ATMEL CORP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, 25 MHz, MICROCONTROLLER, CQCC44
封裝: LCC-44
文件頁數(shù): 85/142頁
文件大?。?/td> 61013K
代理商: MR80C154-25P883D
47
XMEGA B3 [DATASHEET]
8074D–AVR–08/2013
27.
CRC – Cyclic Redundancy Check Generator
27.1
Features
Cyclic redundancy check (CRC) generation and checking for
Communication data
Program or data in flash memory
Data in SRAM and I/O memory space
Integrated with flash memory, DMA controller and CPU
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 polynomial software selectable to
CRC-16 (CRC-CCITT)
CRC-32 (IEEE 802.3)
Zero remainder detection
27.2
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 transmission, 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-n of all longer error
bursts. The CRC module in XMEGA devices supports two commonly used CRC polynomials; CRC-16 (CRC-CCITT) and
CRC-32 (IEEE 802.3).
CRC-16:
CRC-32:
Polynomial:
x
16+x12+x5+1
Hex value:
0x1021
Polynomial:
x32+x26+x23+x22+x16+x12+x11+x10+x8+x7+x5+x4+x2+x+1
Hex value:
0x04C11DB7
相關(guān)PDF資料
PDF描述
MQ83C154XXX-36/883R 8-BIT, MROM, 36 MHz, MICROCONTROLLER, CQFP44
MQ80C154-20P883 8-BIT, 20 MHz, MICROCONTROLLER, CQFP44
IR80C52CXXX-12:RD 8-BIT, MROM, 12 MHz, MICROCONTROLLER, CQCC44
IS83C154TXXX-25D 8-BIT, MROM, 25 MHz, MICROCONTROLLER, PQCC44
IF180C52EXXX-L16:R 8-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP44
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MR80C154-30 制造商:TEMIC 制造商全稱:TEMIC Semiconductors 功能描述:CMOS 0 to 36 MHz Single Chip 8-bit Microcontroller
MR80C154-36 制造商:TEMIC 制造商全稱:TEMIC Semiconductors 功能描述:CMOS 0 to 36 MHz Single Chip 8-bit Microcontroller
MR80C154-L16 制造商:TEMIC 制造商全稱:TEMIC Semiconductors 功能描述:CMOS 0 to 36 MHz Single Chip 8-bit Microcontroller
MR80C31BH 制造商:ROCHESTER 制造商全稱:ROCHESTER 功能描述:CMOS SINGLE - CHIP 8-BIT MICROCOMPUTER 64K program Memory Space
MR80C31BH/B 制造商:n/a 功能描述:8506401XA