對于傳統的跑步機無法聯機組網,保存歷史數據,實時調試等問題,介紹了一個由多臺跑步機通過RS-232串行總線與上位機相連組成的跑步機聯網系統。系統采用W77E58作為下位機核心控制器件,它具有雙串行通訊端口,其中一個串口用于與變頻器通訊,另一個串口則與上位機相連,構成跑步機網絡。 Abstract: The traditional running machine can not be connected to a network, saving historical data, real time debug etc.In this paper,a new network system which is composed of running machines connected by a RS-232 communication bus is introduced.In the system,W77E58 is used as a core control unit.W77E58 has two serial ports,one is connected to the inverter and the other is connected to the PC. Thus a network appears.
上傳時間: 2014-12-27
上傳用戶:哇哇哇哇哇
介紹了電力操作電源與智能電池巡檢系統的特點,給出了一種基于超低功耗單片機MSP430 F149針對中小型變電站自動化運行的專用設備的基本設計原理及實現方法,最后給出了詳細硬件構成和軟件實現。該系統能滿足中小型變電站安全、可靠、自動運行的要求,并通過與上位機的串行通信實現變電站的遠程管理和控制。 Abstract: The characters of the intelligent battery data logging system of the electric operation power are introduced.The basic design principle and the implemented methods of the special equipment which only designed for the middle or small transformer substation based on MSP430F149 are prescribed. Finally, the hardware block diagram and the software flow chart are also given. The function that the system finally needs to realize can basically meet with the middle or small transformer substation’s satisfy, reliably,and automatic running.And it can also realize the transformer substation long-distance management and control by serial communicating with the host computer.
上傳時間: 2013-11-25
上傳用戶:黃華強
對于瀝青混凝土攤鋪機自動找平控制系統來說,數字式控制系統的研制是目前的一個方向。介紹了一種基于CAN總線的數字式自動找平控制系統。該系統以CAN總線作為通信方式,PWM控制信號通過C8051F040單片機內部PCA可編程計數器陣列產生,并具有結構簡單、信號穩定、實時性強、易擴展的特點。通過硬件實現和系統運行達到了比較理想的控制效果,驗證了系統的可行性。 Abstract: A digital auto-leveling control system based on CAN Bus is introduced.It uses CAN Bus as the method of communication and creates PWM signals by programmable counter array in C8051F040 microcontroller. The system is simple, stable, real-time and expansive.
上傳時間: 2013-10-09
上傳用戶:ligi201200
The PCF8578 is a low power CMOS1 LCD row and column driver, designed to drive dotmatrix graphic displays at multiplex rates of 1:8, 1:16, 1:24 or 1:32. The device has40 outputs, of which 24 are programmable and configurable for the following ratios ofrows/columns: 32¤8, 24¤16, 16¤24 or 8¤32. The PCF8578 can function as a stand-alone LCDcontroller and driver for use in small systems. For larger systems it can be used inconjunction with up to 32 PCF8579s for which it has been optimized. Together these twodevices form a general purpose LCD dot matrix driver chip set, capable of driving displaysof up to 40960 dots. The PCF8578 is compatible with most microcontrollers andcommunicates via a two-line bidirectional bus (I2C-bus). Communication overhead isminimized by a display RAM with auto-incremented addressing and display bankswitching.
上傳時間: 2013-10-23
上傳用戶:頂得柱
針對當前安檢力學試驗機所能完成的試驗種類單一、自動化程度低等問題,提出一種以ATmega128單片機為核心控制器的安檢力學試驗機的設計。詳細闡述了該安檢力學試驗機各個組成部分的設計原理和方案,并且給出了各部分的軟件設計思想和操作流程。經過大量測試試驗表明:設計的安檢力學試驗機可以完成多達十余種的力學安檢試驗,完全符合相關國家標準,并且具有數據采集精度高、傳輸速度快、操作安全簡便等特點,實現了安檢設備的多功能化、數字化和自動化。 Abstract: Currently, many mechanical security testing machines have only one function. The degree of automation of them is low. To solve those problems, a new kind of mechanical security testing machine, using ATmega128 micro-controller as its core controller, has been advanced. It describes the components of the machine. The principles and the scheme in the designing processes are presented in detail, and the software architecture and the operation processes of each part are given. After having done many testing, we have reached the following conclusions: the mechanical security testing machine presented can do over ten mechanical security tests complying with related national standards. It has high data acquisition accuracy and high transmission speed. The operation of the machine is simple and safe. In general, this machine is a multi-functional, highly automatic, digitalized security testing device.
上傳時間: 2013-11-05
上傳用戶:a67818601
The CAT93C46 is a 1 kb Serial EEPROM memory device which isconfigured as either 64 registers of 16 bits (ORG pin at VCC) or 128registers of 8 bits (ORG pin at GND). Each register can be written (orread) serially by using the DI (or DO) pin. The CAT93C46 features aself−timed internal write with auto−clear. On−chip Power−On Resetcircuit protects the internal logic against powering up in the wrongstate.
上傳時間: 2013-11-20
上傳用戶:ynzfm
Features• Complete DTMF Receiver• Low power consumption• Internal gain setting amplifier• Adjustable guard time• Central office quality• Power-down mode• Inhibit mode• Backward compatible withMT8870C/MT8870C-1Applications• Receiver system for British Telecom (BT) orCEPT Spec (MT8870D-1)• Paging systems• Repeater systems/mobile radio• Credit card systems• Remote control• Personal computers• Telephone answering machine
上傳時間: 2013-11-20
上傳用戶:mpquest
CCAVR軟件有ISP功能,能過調用STK500完成的,只要設置好參數,在ICCAVR中就可以給芯片編程了,還可以讓程序一編譯完就自動下載到芯片中,相當方便。在Tools->environment options->ISP里設定STK500.exe的路徑?!?用于調用STK500程序。在Tools->In system programming 里Programmer Interface中選中STK500?!?選擇STK500下載方式。在Tools->In system programming 里把Auto Program After Compile 的小勾選上。— 編譯后自動編程。在Tools->In system programming 中還有一些設置項,大家可以根據需要進行相關設置。下面的圖片是操作過程。
上傳時間: 2013-11-17
上傳用戶:joseph
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.
上傳時間: 2013-11-16
上傳用戶:浩子GG
ARM處理器的工作模式 ARM處理器狀態 ARM微處理器的工作狀態一般有兩種,并可在兩種狀態之間切換:第一種為ARM狀態,此時處理器執行32位的字對齊的ARM指令;第二種為Thumb狀態,此時處理器執行16位的、半字對齊的Thumb指令。在程序的執行過程中,微處理器可以隨時在兩種工作狀態之間切換,并且,處理器工作狀態的轉變并不影響處理器的工作模式和相應寄存器中的內容。但ARM微處理器在開始執行代碼時,應該處于ARM狀態。 ARM處理器狀態 進入Thumb狀態:當操作數寄存器的狀態位(位0)為1時,可以采用執行BX指令的方法,使微處理器從ARM狀態切換到Thumb狀態。此外,當處理器處于Thumb狀態時發生異常(如IRQ、FIQ、Undef、Abort、SWI等),則異常處理返回時,自動切換到Thumb狀態。 進入ARM狀態:當操作數寄存器的狀態位為0時,執行BX指令時可以使微處理器從Thumb狀態切換到ARM狀態。此外,在處理器進行異常處理時,把PC指針放入異常模式鏈接寄存器中,并從異常向量地址開始執行程序,也可以使處理器切換到ARM狀態。ARM處理器模式 ARM微處理器支持7種運行模式,分別為:用戶模式(usr):ARM處理器正常的程序執行狀態。快速中斷模式(fiq):用于高速數據傳輸或通道處理。外部中斷模式(irq):用于通用的中斷處理。管理模式(svc):操作系統使用的保護模式。數據訪問終止模式(abt):當數據或指令預取終止時進入該模式,可用于虛擬存儲及存儲保護。系統模式(sys):運行具有特權的操作系統任務。定義指令中止模式(und):當未定義的指令執行時進入該模式,可用于支持硬件協處理器的軟件仿真。ARM處理器模式 ARM微處理器的運行模式可以通過軟件改變,也可以通過外部中斷或異常處理改變。大多數的應用程序運行在用戶模式下,當處理器運行在用戶模式下時,某些被保護的系統資源是不能被訪問的。 除用戶模式以外,其余的所有6種模式稱之為非用戶模式,或特權模式;其中除去用戶模式和系統模式以外的5種又稱為異常模式,常用于處理中斷或異常,以及需要訪問受保護的系統資源等情況。ARM寄存器 ARM處理器共有37個寄存器。其中包括:31個通用寄存器,包括程序計數器(PC)在內。這些寄存器都是32位寄存器。以及6個32位狀態寄存器。 關于寄存器這里就不詳細介紹了,有興趣的人可以上網找找,很多這方面的資料。異常處理 當正常的程序執行流程發生暫時的停止時,稱之為異常,例如處理一個外部的中斷請求。在處理異常之前,當前處理器的狀態必須保留,這樣當異常處理完成之后,當前程序可以繼續執行。處理器允許多個異常同時發生,它們將會按固定的優先級進行處理。當一個異常出現以后,ARM微處理器會執行以下幾步操作:進入異常處理的基本步驟:將下一條指令的地址存入相應連接寄存器LR,以便程序在處理異常返回時能從正確的位置重新開始執行。將CPSR復制到相應的SPSR中。根據異常類型,強制設置CPSR的運行模式位。強制PC從相關的異常向量地址取下一條指令執行,從而跳轉到相應的異常處理程序處。如果異常發生時,處理器處于Thumb狀態,則當異常向量地址加載入PC時,處理器自動切換到ARM狀態。 ARM微處理器對異常的響應過程用偽碼可以描述為: R14_ = Return LinkSPSR_= CPSRCPSR[4:0] = Exception Mode NumberCPSR[5] = 0 ;當運行于 ARM 工作狀態時If == Reset or FIQ then;當響應 FIQ 異常時,禁止新的 FIQ 異常CPSR[6] = 1PSR[7] = 1PC = Exception Vector Address異常處理完畢之后,ARM微處理器會執行以下幾步操作從異常返回:將連接寄存器LR的值減去相應的偏移量后送到PC中。將SPSR復制回CPSR中。若在進入異常處理時設置了中斷禁止位,要在此清除。
上傳時間: 2013-11-15
上傳用戶:hanbeidang