The CAT28LV64 is a low voltage, low power, CMOS Parallel EEPROM organized as 8K x 8−bits. It requires a simple interface for in−system programming. On−chip address and data latches, self−timed write cycle with auto−clear and VCC power up/down write protection eliminate additional timing and protection hardware. DATA Polling and Toggle status bit signal the start and end of the self−timed write cycle. Additionally, the CAT28LV64 features hardware and software write protection.
上傳時(shí)間： 2013-11-16
上傳用戶：浩子GG
51單片機(jī)實(shí)訓(xùn)指南:一、 實(shí)習(xí)課題基于單片機(jī)最小系統(tǒng)的頻率計(jì)設(shè)計(jì)二、 實(shí)習(xí)內(nèi)容單片機(jī)最小系統(tǒng)電路原理設(shè)計(jì)分析與講解，PCB設(shè)計(jì)分析與講解，電路板焊接培訓(xùn)與實(shí)際操作，程序設(shè)計(jì)、調(diào)試分析與講解，程序調(diào)試實(shí)際操作。三、硬件資源※ 89S51單片機(jī)；※ 6位共陽(yáng)極數(shù)碼管；※ 段碼驅(qū)動(dòng)器74HC573，位選譯碼器74HC138；※ 4路獨(dú)立式按鍵；※ 外部晶振電路；※ ISP下載接口（In system program,在系統(tǒng)編程）；※ DC+5V電源試配器（選配）；※ ISP下載線（選配）；※ 單片機(jī)實(shí)訓(xùn)模塊（頻率計(jì)分頻預(yù)處理電路）。四、電路原理分析與設(shè)計(jì)P1為外部電源輸入座（DC+5V），S8為電源最小系統(tǒng)的電源開(kāi)關(guān)，E1和C3為電源濾波，去耦電容。D1為系統(tǒng)電源指示燈。J2為ISP下載接口，S7系統(tǒng)復(fù)位按鍵。CRY1，C1，C2為外部時(shí)針電路。IC1為89S51（DIP-40），左上角為第一腳。PRE1，PRE2。為上拉排阻（阻值4.7k—10k）。J5，J9，J6，J10分別對(duì)應(yīng)單片機(jī)的P0，P1，P2，P3口。便于二次開(kāi)發(fā)。6路共陽(yáng)極數(shù)碼管動(dòng)態(tài)顯示電路，P0口通過(guò)74HC573（起驅(qū)動(dòng)和隔離作用，讓電流通過(guò)74CH573流入公共地），來(lái)控制數(shù)碼管的8路段碼，P20-P22通過(guò)74HC138譯碼器（使用其中的6路）控制數(shù)碼管的公共端（中間還有三極管做驅(qū)動(dòng)器）。這樣設(shè)計(jì)的理由：為了保證該單片機(jī)最小系統(tǒng)的二次開(kāi)發(fā)的資源充足和合理性。
標(biāo)簽： 51單片機(jī)
上傳時(shí)間： 2013-10-14
上傳用戶：ryb
The μPSD32xx family, from ST, consists of Flash programmable system devices with a 8032 MicrocontrollerCore. Of these, the μPSD3234A and μPSD3254A are notable for having a complete implementationof the USB hardware directly on the chip, complying with the Universal Serial Bus Specification, Revision1.1.This application note describes a demonstration program that has been written for the DK3200 hardwaredemonstration kit (incorporating a μPSD3234A device). It gives the user an idea of how simple it is to workwith the device, using the HID class as a ready-made device driver for the USB connection.IN-APPLICATION-PROGRAMMING (IAP) AND IN-System-PROGRAMMING (ISP)Since the μPSD contains two independent Flash memory arrays, the Micro Controller Unit (MCU) can executecode from one memory while erasing and programming the other. Product firmware updates in thefield can be reliably performed over any communication channel (such as CAN, Ethernet, UART, J1850)using this unique architecture. For In-Application-Programming (IAP), all code is updated through theMCU. The main advantage for the user is that the firmware can be updated remotely. The target applicationruns and takes care on its own program code and data memory.IAP is not the only method to program the firmware in μPSD devices. They can also be programmed usingIN-System-Programming (ISP). A IEEE1149.1-compliant JTAG interface is included on the μPSD. Withthis, the entire device can be rapidly programmed while soldered to the circuit board (Main Flash memory,Secondary Boot Flash memory, the PLD, and all configuration areas). This requires no MCU participation.The MCU is completely bypassed. So, the μPSD can be programmed or reprogrammed any time, anywhere, even when completely uncommitted.Both methods take place with the device in its normal hardware environment, soldered to a printed circuitboard. The IAP method cannot be used without previous use of ISP, because IAP utilizes a small amountof resident code to receive the service commands, and to perform the desired operations.
標(biāo)簽： Demonstration 3200 USB for
上傳時(shí)間： 2014-02-27
上傳用戶：zhangzhenyu
The AT89C52 is a low-power, high-performance CMOS 8-bit microcomputer with 8Kbytes of Flash programmable and erasable read only memory (PEROM). The deviceis manufactured using Atmel’s high-density nonvolatile memory technology and iscompatible with the industry-standard 80C51 and 80C52 instruction set and pinout.The on-chip Flash allows the program memory to be reprogrammed IN-System or by aconventional nonvolatile memory programmer. By combining a versatile 8-bit CPUwith Flash on a monolithic chip, the Atmel AT89C52 is a powerful microcomputerwhich provides a highly-flexible and cost-effective solution to many embedded controlapplications.
上傳時(shí)間： 2013-11-10
上傳用戶：1427796291
什么是JTAG 到底什么是JTAG呢？ JTAG(Joint Test Action Group)聯(lián)合測(cè)試行動(dòng)小組)是一種國(guó)際標(biāo)準(zhǔn)測(cè)試協(xié)議（IEEE 1149.1兼容），主要用于芯片內(nèi)部測(cè)試。現(xiàn)在多數(shù)的高級(jí)器件都支持JTAG協(xié)議，如DSP、FPGA器件等。標(biāo)準(zhǔn)的JTAG接口是4線：TMS、 TCK、TDI、TDO，分別為模式選擇、時(shí)鐘、數(shù)據(jù)輸入和數(shù)據(jù)輸出線。 JTAG最初是用來(lái)對(duì)芯片進(jìn)行測(cè)試的，基本原理是在器件內(nèi)部定義一個(gè)TAP（Test Access Port�測(cè)試訪問(wèn)口）通過(guò)專用的JTAG測(cè)試工具對(duì)進(jìn)行內(nèi)部節(jié)點(diǎn)進(jìn)行測(cè)試。JTAG測(cè)試允許多個(gè)器件通過(guò)JTAG接口串聯(lián)在一起，形成一個(gè)JTAG鏈，能實(shí)現(xiàn)對(duì)各個(gè)器件分別測(cè)試。現(xiàn)在，JTAG接口還常用于實(shí)現(xiàn)ISP（IN-System rogrammable�在線編程），對(duì)FLASH等器件進(jìn)行編程。 JTAG編程方式是在線編程，傳統(tǒng)生產(chǎn)流程中先對(duì)芯片進(jìn)行預(yù)編程現(xiàn)再裝到板上因此而改變，簡(jiǎn)化的流程為先固定器件到電路板上，再用JTAG編程，從而大大加快工程進(jìn)度。JTAG接口可對(duì)PSD芯片內(nèi)部的所有部件進(jìn)行編程 JTAG的一些說(shuō)明 通常所說(shuō)的JTAG大致分兩類，一類用于測(cè)試芯片的電氣特性，檢測(cè)芯片是否有問(wèn)題；一類用于Debug；一般支持JTAG的CPU內(nèi)都包含了這兩個(gè)模塊。 一個(gè)含有JTAG Debug接口模塊的CPU，只要時(shí)鐘正常，就可以通過(guò)JTAG接口訪問(wèn)CPU的內(nèi)部寄存器和掛在CPU總線上的設(shè)備，如FLASH，RAM，SOC（比如4510B，44Box，AT91M系列）內(nèi)置模塊的寄存器，象UART，Timers，GPIO等等的寄存器。 上面說(shuō)的只是JTAG接口所具備的能力，要使用這些功能，還需要軟件的配合，具體實(shí)現(xiàn)的功能則由具體的軟件決定。 例如下載程序到RAM功能。了解SOC的都知道，要使用外接的RAM，需要參照SOC DataSheet的寄存器說(shuō)明，設(shè)置RAM的基地址，總線寬度，訪問(wèn)速度等等。有的SOC則還需要Remap，才能正常工作。運(yùn)行Firmware時(shí)，這些設(shè)置由Firmware的初始化程序完成。但如果使用JTAG接口，相關(guān)的寄存器可能還處在上電值，甚至?xí)r錯(cuò)誤值，RAM不能正常工作，所以下載必然要失敗。要正常使用，先要想辦法設(shè)置RAM。在ADW中，可以在Console窗口通過(guò)Let 命令設(shè)置，在AXD中可以在Console窗口通過(guò)Set命令設(shè)置。
上傳時(shí)間： 2013-10-23
上傳用戶：aeiouetla
This application note explains the XC9500™/XL/XV Boundary Scan interface anddemonstrates the software available for programming and testing XC9500/XL/XV CPLDs. Anappendix summarizes the iMPACT software operations and provides an overview of theadditional operations supported by XC9500/XL/XV CPLDs for IN-System programming.
上傳時(shí)間： 2013-11-15
上傳用戶：fengweihao158@163.com
This application note contains a reference design consisting of HDL IP and Xilinx AdvancedConfiguration Environment (ACE) software utilities that give designers great flexibility increating IN-System programming (ISP) solutions. IN-System programming support allowsdesigners to revise existing designs, package the new bitstream programming files with theprovided software utilities, and update the remote system through the JTAG interface using theEmbedded JTAG ACE Player.
上傳時(shí)間： 2013-11-14
上傳用戶：JIMMYCB001
Prakash Rashinkar has over 15 years experience in system design and verificationof embedded systems for communication satellites, launch vehicles and spacecraftground systems, high-performance computing, switching, multimedia, and wirelessapplications. Prakash graduated with an MSEE from Regional Engineering College,Warangal, in India. He lead the team that was responsible for delivering themethodologies for SOC verification at Cadence Design Systems. Prakash is anactive member of the VSIA Functional Verification DWG. He is currently Architectin the Vertical Markets and Design Environments Group at Cadence.
上傳時(shí)間： 2014-01-24
上傳用戶：xinhaoshan2016
On the LPC13xx, programming, erasure and re-programming of the on-chip flash can be performed using IN-System Programming (ISP) via the UART serial port, and also, can be performed using In-Application Programming (IAP) calls directed by the end-user code. For IN-System Programming (ISP) via the UART serial port, the ISP command handler (resides in the bootloader) allows erasure of one or more sector (s) of the on-chip flash memory.
標(biāo)簽： 1300 LPC 勘誤 數(shù)據(jù)手冊(cè)
上傳時(shí)間： 2013-12-13
上傳用戶：lmq0059
This application note contains a reference design consisting of HDL IP and Xilinx AdvancedConfiguration Environment (ACE) software utilities that give designers great flexibility increating IN-System programming (ISP) solutions. IN-System programming support allowsdesigners to revise existing designs, package the new bitstream programming files with theprovided software utilities, and update the remote system through the JTAG interface using theEmbedded JTAG ACE Player.
上傳時(shí)間： 2013-10-22
上傳用戶：gai928943
蟲(chóng)蟲(chóng)下載站版權(quán)所有 京ICP備2021023401號(hào)-1
