【正文】 在大專的校園里，我不僅學(xué)到了豐富的專業(yè)知識，也學(xué)到了終身受用的學(xué)習(xí)知識和積極的生活態(tài)度，通過對課程的學(xué)習(xí)和與相關(guān)專業(yè)老師的溝通，使我深感機(jī)會難得，獲益非淺。 SGSN和 GGSN兩節(jié)點可分可合 ,即它們的功能既可以由一個物理節(jié)點全部實現(xiàn) ,也可以由不同的物理節(jié)點來實現(xiàn)。因此 GPRS業(yè)務(wù)在無線上網(wǎng)、環(huán)境監(jiān)測、交通監(jiān)控、移動辦公等行業(yè)中具有無可比擬的性價比優(yōu)勢。 無錫科技職業(yè)學(xué)院畢業(yè)設(shè)計（論文） 基于單片機(jī)的多功能電表設(shè)計 19 RE RE為低時， RO有效，為高時， RO呈高阻狀態(tài)。 RE接收器輸出使能端。當(dāng)讀出的數(shù)據(jù)單元到達(dá)最大一個單元時 ,下一個被讀出的單元地址將為最小的地址單元 ,如讀到 AT24C04的最大地址單元為 1FFH個讀數(shù)單元為 000H。對于容量更大的 AT24C32/64，顯然再借用 A A A0 是不夠的無錫科技職業(yè)學(xué)院畢業(yè)設(shè)計（論文） 基于單片機(jī)的多功能電表設(shè)計 15 因此緊跟在器件地址后的存儲器單元地址采用 2個字節(jié) ，高位地址在前低位地址CPU 發(fā)出的 0 值必須與該器件上的 0邏輯相匹配。 ● SDA，串行數(shù)據(jù)輸入 |輸出端。在 i2c 總線技術(shù)規(guī)范中 ，有嚴(yán)格的時序表示起始信號和結(jié)束信號，或起始信號和停止信號。不同的 單 片機(jī)可能提供不同 標(biāo)準(zhǔn)的串行通信接口，如 UART、 SPI、 2IC、 Micro Wire 等。 時鐘 (CLK) 每次由低變高時 ，數(shù)據(jù)右移一位，輸入到 Q0， Q0 是兩個數(shù)據(jù)輸入端 ， A 和 B，的 邏輯與，它將上升時鐘沿之前保持一個建立時間的長度。 ADE7755內(nèi)部包含一個對 AVDD 電源引腳的監(jiān)控電路。電流通道中的 PGA 進(jìn)一步簡化了傳感器接口。 多功能電能表能夠更精確、更快速的完成對電能的計量任務(wù) ，而且電表可以通過加密防止用戶竊電，安全性更高。 關(guān)鍵詞： 功率測量 、 AT89C51 單片機(jī) 、 ADE775 LED 顯示 無錫科技職業(yè)學(xué)院畢業(yè)設(shè)計（論文） 基于單片機(jī)的多功能電表設(shè)計 ii Electricity automatic controller Abstract： Along with the material life of the rich, many people move into the city, as the 1 part of your life. We use FM3307\/8 microcontroller as the core of the 8 households electricity consumption measurement, let everyone know what how to use single chip microputer to measure the amount of power. 8 pulse output electric energy metering chip AD7755 to the residents of the electricity into a certain number of pulses. 74HC164 series input and output 8 bit shift register and LED monitor can display realtime circulation of 8 households of electricity. AT24C16 through the I2C bus and the singlechip is connected with the MCU will residents consumption realtime write AT24C16 when power AT24C16 can still save the data once again after power on the MCU will save the data read in order to achieve powerdown protection. Electric energy meter through the RS485 bus and the concentrator is connected to receive the meter reading concentrator reading or prepaid, reset mand. Meter reading concentrator has GPRS munication module MC55 to realize data ， the upload or mand through GPRS munication work and center puter connection issued. When working, voltage through the resistor divider, a current through the current transformer in the sampling resistance after sampling, into the special power chip for processing, and converted into digital signal is sent to the CPU calculation. Due to the adoption of a special power chip, the voltage and current sampling resolution is improved greatly, and have enough time to more accurate measurement of electric energy metering, so that the electric power meter accuracy has been significantly improved. CPU is used for timesharing charging and processing a variety of input and output data, the special power chip via the serial interface to read data, and according to the preset time plete the timesharing active electric energy metering and demand maximum measurement function, according to the need to display the data munication transmission, infrared or RS485 interface, monitoring and operation parameters store all kinds of data, records. Let the puter according to the different price of electricity time division point of the realization of multirate 無錫科技職業(yè)學(xué)院畢業(yè)設(shè)計（論文） 基于單片機(jī)的多功能電表設(shè)計 iii function table. Computer users will advance purchase power into electric energy meter when in power to 0 of the control port， P4 action to cut off power supply. Key Words: power measurement、 AT89C51 MCU、 ADE775 LED display 無錫科技職業(yè)學(xué)院畢業(yè)設(shè)計（論文） 基于單片機(jī)的多功能電表設(shè)計 iv 目錄 前言 ................................................................................................................................ 1 第一章 論述 ................................................................................................................ 2 課題的 背景及應(yīng)用范圍 ...................................................................................... 2 課題的目的 .......................................................................................................... 2 第二章 脈沖輸出的電能計量集成電路 .................................................................... 3 論述 ..................................................................................................................... 3 工作原理 ......................................................................................................