Bootloader是微處理器上電時運行的第一段代碼,它可以通過通信接口實現對微處理器內部應用程序的更新升級,為網絡化嵌入式產品的應用程序升級帶來極大的便利。由于目前沒有統一嵌入式系統的Bootloader。基于NEC 78K0系列單片機自編程原理,設計出一個適用于78K0/Fx2系列單片機的Bootloader,并能夠通過單片機串口在線升級應用程序。 Abstract: Bootloader is the first piece of code executed after microprocessor startup. It makes the embedded product’s firmware update conveniently through communication interface. However, no unified bootloader is available for all kinds of microprocessor products. Based on the principle of self-programming NEC 78K0s’ series, a useful Bootloader which is suitable for 78K0/Fx2s’ series MCU is designed,the design can update the application through serial ports.
標簽: Bootloader MCU 自編程
上傳時間: 2013-10-26
上傳用戶:fang2010
The bootloader is stored in the internal boot ROM memory (system memory) of STM32devices. It is programmed by ST during production. Its main task is to download theapplication program to the internal Flash memory through one of the available serialperipherals (USART, CAN, USB, etc.). A communication protocol is defined for each serialinterface, with a compatible command set and sequences
上傳時間: 2014-09-06
上傳用戶:417313137
要搞清楚單片機與PLC的異同,首先得明確什幺是單片機,什幺是PLC。對此,我們簡要回顧一下計算機的發展歷程也許有幫助,按計算機專家的原始定義,計算機系統由五大部分--即控制單元(CU)、算術運算單元(ALU)、存儲器(Memory)、輸入設備(Input)、輸出設備(Output)組成。早期計算機(晶體管的或集成電路的,不包括電子管的)的CU或ALU由一塊甚至多塊電路板組成,CU和ALU是分離的,隨著集成度的提高,CU和ALU合在一塊就組成了中央處理單元(CPU),接著將CPU集成到單塊集成電路中就產生MPU或MCU,出現了如Intel4004、8008、8080,8085、8086、8088、Z80等MPU。此后,MPU的發展產生了兩條分支,一支往高性能、高速度、大容量方向發展,典型芯片如:Intel80186、286、386、486、586、P2、P3、P4等,速度從4.7MHz到現在的3.2GHz。另一支則往多功能方向發展,將存儲器(ROM、PROM、EPROM、EEPROM、FLASHROM、SRAM等)、輸入/出接口(Timer/Counter、PWM、ADC/DAC、UART、IIC、SPI、RTC、PCA、FPGA等)全部集成在一塊集成電路中而成為SOC。依愚之見,這就是當今廣泛應用的單片計算機,簡稱單片機。這一分支可謂品種繁多,位寬從8位到32位,引腳數從6個到幾百個,工作頻率從幾十KHz到幾百MHz,體系結構既有CISC也有RISC,數不勝數。常用的有MCS-51系列、MCS-96系列、PIC系列、AVR系列、ARM7/9系列、TMS320系列、MSP430系列、MOTOROLA眾多的單片機等等。
上傳時間: 2013-10-16
上傳用戶:jjj0202
The PCA9536 is an 8-pin CMOS device that provides 4 bits of General Purpose parallel Input/Output (GPIO) expansion for I2C-bus/SMBus applications and was developed to enhance the NXP Semiconductors family of I2C-bus I/O expanders. I/O expanders provide a simple solution when additional I/O is needed for ACPI power switches, sensors, push buttons, LEDs, fans, etc.
上傳時間: 2013-10-27
上傳用戶:w230825hy
The PCA9534 is a 16-pin CMOS device that provide 8 bits of General Purpose parallel Input/Output (GPIO) expansion for I2C-bus/SMBus applications and was developed to enhance the NXP Semiconductors family of I2C-bus I/O expanders. The improvements include higher drive capability, 5 V I/O tolerance, lower supply current, individual I/O configuration, 400 kHz clock frequency, and smaller packaging. I/O expanders provide a simple solution when additional I/O is needed for ACPI power switches, sensors, push buttons, LEDs, fans, etc.
上傳時間: 2013-11-17
上傳用戶:vodssv
NEC 16位MCU參考手冊 The 78K0R/IC3 is a 16-bit single-chip microcontroller that uses a 78K0R CPU core and incorporates peripheral functions, such as ROM/RAM, a multi-function timer, a multi-function serial interface, an A/D converter, a programmable gain amplifier (PGA), a comparator, a real-time counter, and a watchdog timer.
上傳時間: 2013-11-02
上傳用戶:努力努力再努力
The CAT34C02 is a 2 kb Serial CMOS EEPROM, internallyorganized as 16 pages of 16 bytes each, for a total of 256 bytes of 8 bitseach.
上傳時間: 2013-10-23
上傳用戶:ppeyou
CAT5110/18/19/23/24/25 linear-taper digitally programmable potentiometers perform the same function as a mechanical potentiometer or a variable resistor. These devices consist of a fixed resistor and a wiper contact with 32-tap points that are digitally controlled through a2-wire up/down serial interface.
上傳時間: 2013-11-22
上傳用戶:541657925
用戶程序示例教程 The Blinky project is a simple program for the LPC2138using Keil MCB2130 Microcontroller Board. It blinks the LEDs at speed according to the Potentiometer setting and prints the current seting to the Serial Port 1.In addition it generates a sine wave with an adjustable frequency on the speaker of the board.
上傳時間: 2014-12-27
上傳用戶:hongmo
以典型的9S08 系列為例,當你選擇了一個MCU 型號后,在圖1-4 右側會顯示出所有針對該型號芯片可用的項目調試場景。其中:Full Chip Simulator是芯片全功能模擬仿真,即無需任何目標系統的硬件資源,直接在你的PC 機上模擬運行單片機的程序,在模擬運行過程中可以觀察調試程序的各項控制和運行流程,分析代碼運行的時間,觀察各種變量,等等。CW 提供了功能強大的模擬激勵功能,可以在模擬運行時模擬一些外部事件的輸入,配合程序調試;P&E Multilink/Cyclone Pro是基于P&E 公司的硬件調試工具實現實時在線硬件調試。實際就是我們經常說的BDM 調試。BDM 調試是基于芯片本身內含的在線調試功能,可實現程序下載,單步/全速運行,可以設若干個斷點,可以觀察和修改任意寄存器或RAM 內存空間。BDM 幾乎是開發飛思卡爾8 位(9S08 和RS08 系列)、16 位(9S12 系列)和32 位(Coldfire V1 系列)單片機的標準調試模式,運用最為廣泛;SofTec HCS08是另外一家SofTec 公司提供的硬件調試工具,國內使用較少;HCS08 Serial Monitor是基于芯片串口的監控調試開發模式。由于開發效率較低,現在幾乎無人使用。
上傳時間: 2013-10-10
上傳用戶:alex wang