参数资料
型号: MC68HC05V12CFNR2
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQCC68
封装: PLASTIC, LCC-68
文件页数: 78/135页
文件大小: 2080K
代理商: MC68HC05V12CFNR2
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
相关PDF资料
PDF描述
MC68HC08AS20FNR2 8-BIT, MROM, MICROCONTROLLER, PQCC52
MC68HC08AS20VFNR2 8-BIT, MROM, MICROCONTROLLER, PQCC52
MC68HC08AS20CFN 8-BIT, MROM, MICROCONTROLLER, PQCC52
MC68HC08AZ48AVFU 8-BIT, MROM, 8.4 MHz, MICROCONTROLLER, PQFP64
MC68HC08AZ60FU 8-BIT, MROM, 8.4 MHz, MICROCONTROLLER, PQFP64
相关代理商/技术参数
参数描述
MC68HC05X16 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:High-density complementary metal oxide semiconductor HCMOS) microcontroller unit
MC68HC05X32 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:High-density complementary metal oxide semiconductor HCMOS) microcontroller unit
MC68HC05X4 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit
MC68HC05X4CDW 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit
MC68HC05X4DW 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit