on with "27" headers are EPROM (486 and less than 486 of the computer using the chip), while 28c010, 29c010, 29c020, 29c040, etc., are EEPROM, 29c010 is 128 K * 8, that is, 1 M bit Parallel EPROM, 29c010 is 128 K * 8 (1 M bit), 29c020 is 256 K * 8 (2 M bit) 29c040 is a 512 K * 8 (4 M bit) Flash ROM (586 and PII, piII BIOS chip ). Serial EEPROM is rare on the computer motherboard, and most of the manufacturers that provide these chips are MX, WINBOND, Atmel
parts network (http://www.icminer.com)
21. China PCB Technology Network (http://www.pcbtech.net)
22. PCB Information Network (http://www.pcbinfo.net)
23. EDA Forum China (http://www.edachina.com)
24. Programmable Logic Device (http://www.pld.com.cn)
25. China PCB World Information Network (http://www.pcbworld.net)
26. PCB design technology training network (http://pcb.imbchina.com)
27. PCB Club (http://www.pcb-info.net)
28. Electronic World (http://www.eleworld.com)
29. DSP engineer Community F
network configurationFigure 4 shows the configuration and information transmission process of the GPRS network. The terminal device is connected to the GPRS Modem in serial mode, and the GPRS Modem communicates with the GSM base station. In the figure, BTS is the receiving and sending system of the base station, BSc is the base station controller. Unlike circuit switching or data calling, the GPRS data group sends data from the base station to the sgsn node instead of connecting to the voice ne
At the seminar, the two schemes were completely different. One uses a general chip, such as DSP, arm9-and FPGA, and one uses a dedicated chip, such as a copy, scan, and fax integrated chip. The two solutions have their own advantages and disadvantages:
The general-purpose chip has the following advantages:
1. It is easy to purchase chips. Not only depends on one model. Any MCU can. The nxp arm chip can be used, the Atmel chip can also be used, and the
AT45DB041B is 2.7-3.3 V 20 MHz
AT45DB041 is 4.5-5.5 V 10 MHz (discontinued)
AT45DB041 is a new flash chip of ATMEL. The chip has many advantages such as large capacity, fast read/write speed, and few peripheral circuits. More importantly, the chip can work at least 2.5 V, and the operating current is only 4mA, therefore, it has been widely used in mobile communication and portable applications.
Chip working principle and hardware connection
Data i
earlier versions, functions such as readb, writeb, readw, writew, readl, and writel are also provided in the kernel.
Release:Iounmap () and release_mem_region ()
Feng nuiman, Harvard structure:The Harvard structure is a memory structure that separates program instruction storage from data storage. The central processor first reads the program instruction content in the program instruction memory, decodes the content, obtains the data address, and then reads the data in the corresponding data st
Phillips's Mifare card is widely used in the market due to its high security. For example, we use bus cards, meal cards for schools and corporate canteens, etc. each slice has an independent key (six-byte password). During communication, the key must be verified before data can be read and written. its key technology is to use the triple-encryption DES algorithm for key verification (that is, the keys transmitted between the reader and the card are encrypted by random numbers ), unlike the early
1 J-link V8 Firmware Burning InstructionsJ-link is used in the process, if the internal firmware is accidentally damaged or lost, please refer to the following procedure instructions, re-burn the Jlink firmware.1.1 Installing firmware burning software
Please download the at91-isp download software at Atmel official website.
Software: http://www.atmel.com/dyn/products/tools_card.asp?tool_id=3883In the Web page that opens, download the sof
commonly used two, the author also used the two software for many years, there are many similarities. I mainly use mdk-arm To summarize how it is used, and if you use several other software, there may be some differences in some places. Mdk-arm meaning is based onARMMicrocontroller Development Tools (microcontroller Developer Kit), byKeilCompany Development,Mdk-armcontains industry-standardKeil Ccompiler, macro assembler, debugger, real-time kernel and other components. With the leading busines
I'm with Arduino, and why write this series of articlesArduino has been on fire for years, and it's not a new technology. If someone is not clear about what Arduino is, I'm sorry, please search by yourself, open any Wikipedia introduction or a fan of the series of articles, people introduced more than I know more comprehensive. I'm afraid I don't have to repeat it here.The first contact with Arduino was in 2008, then I know nothing about embedded development, just started to learn MCU, that is,
/* Project to create MCU selection, Atmel 89C55 microcontroller: stc15f104w function: 500M seconds Flash LED connection description: Led positive string 1K resistor connected to VCC, negative to MCU 8 feet p3.3*/#include 650) this.width=650; "src=" Http://s4.51cto.com/wyfs02/M02/78/0A/wKiom1Z0IyCTSEKqAADWnwn9KuA736.png "title=" stc15f get started. png "alt=" Wkiom1z0iyctsekqaadwnwn9kua736.png "/>This article is from the "Soul Bucket" blog, please be s
, Atmel And QuickLogic companies, the largest of which is the American Xilinx company, occupies more than 50% of the market share of the programmable market, more than the total market share of all other competitors.An FPGA is a program that is stored in the on-chip RAM to set its working state, so it is necessary to program the on-chip RAM when working. Users can use different programming modes depending on the configuration mode.When the power is on
stored in these directories.6 conclusionOn the basis of introducing the concept, function and VxWorks image classification of BSP and the system start-up process, this paper takes the ARM9 processor at91rm9200 produced by Atmel as an example, and emphatically introduces several important files that need to be modified in the VxWorks BSP design. Finally, some problems needing attention are put forward. Although the target board hardware is different,
Article title: LinuxWorld: open-source computer running Linux. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source.
The embedded system designer Paul Thomas presented his design of the open-source computer, Linuxstamp, at the San Francisco LinuxWorld conference.
The hardware design of Linuxstamp is very simple. it only uses six chips: CPU, RAM, flash memory, ser
In the previous article, we have explained the basic concepts and related principles of the I2C bus protocol. I don't know if you have any knowledge. Now we will introduce this application. First, let's see which devices have the I2C bus protocol.
I2C bus application
At present, many semiconductor integrated circuits have integrated I2C interfaces. Single-Chip Microcomputer with I2C bus protocol interfaces include: CYGNAL C8051F0XX series, Samsung S3C24XX series, PHILIPSP87LPC7XX series, and MIC
I used to want to use the compiler to write the MCU's C code, what the compiler did to help us. How the compiler allocates variables and code. So just idle to see what the compiler's installation path is. The ICCAVR compiler and Atmel Atmega64 are used in the work. So I daoteng this compiler and mcu~~~.To be honest ICCAVR the compiler is really simple and convenient, but powerful (of course, I didn't use the other compiler O (╯-╰) o). For its basic us
generation of electronic product designs. Altium's unified design architecture is known for integrating hardware, software, and programmable hardware into a single application. It allows you to freely explore and develop new design ideas and design ideas within a project, or even across the entire team, each with a unified design view of the entire design process.Notable highlights are as follows:Provides a new desktop platform that puts design data management at the heart of the design process
it is unnecessary to enter the xwindow at startup.
You can also modify the boot. msg, f2, and logo.16 labels under/tmp/boot. This new boot. img can boot knoppix to the new kernel, refill it, And then install the kernel-related driver under the new kernel. Exit the chroot environment and use the new boot. img to recreate iso:
# Cp/mnt/hda1/knx/source/KNOPPIX/var/tmp/boot. img/mnt/hda1/knx/master/KNOPPIX/boot. img
# Cd/mnt/hda1/knx/
# Mkisofs-pad-l-r-J-v-V "KNOPPIX"-B KNOPPIX/boot. img-c KNOP
The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion;
products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the
content of the page makes you feel confusing, please write us an email, we will handle the problem
within 5 days after receiving your email.
If you find any instances of plagiarism from the community, please send an email to:
info-contact@alibabacloud.com
and provide relevant evidence. A staff member will contact you within 5 working days.