【導讀】師的指導下進行的研究工作及取得的成果。盡我所知，除文中特別加。而使用過的材料。均已在文中作了明確的說明并表示了謝意。除了文中特別加以標注引用的內(nèi)容外，本論文。不包含任何其他個人或集體已經(jīng)發(fā)表或撰寫的成果作品。究做出重要貢獻的個人和集體，均已在文中以明確方式標明。全意識到本聲明的法律后果由本人承擔。同意學校保留并向國家有關(guān)部門或機構(gòu)送交論文的復印件和電子版，允許論文被查閱和借閱。本人授權(quán)大學可以將本學位。印或掃描等復制手段保存和匯編本學位論文。涉密論文按學校規(guī)定處理。設(shè)計是否有創(chuàng)意？

　　

【正文】 0060H DOWN: PUSH A CJNE R7, 10H, GODOWN SJMP DOWNEND GODOWN: MOV A, R7 CLR C SUBB A, 01 JNB , GOON SUBB A, 06 GOON: MOV R7, A ACALL DISPLAY DOWNEND: POP A RETI 顯示子程序： ORG 0075H DISPLAY: MOV DPTR, LEDTAB MOV A, 0FH ANL A, R7 MOVC A, @ DPTR+A MOV P1, A MOV A, 0F0H ANL A, R7 SWAP A MOV A, @DPTR+A MOVC P2, A RET ORG 0090H LEDTAB: DB 0C0H,0F9H,0A4H,0B0H,99H 蘇州大學本科生畢業(yè)設(shè)計（論文） 33 DB 92H,82H,0F8H,80H,90H 定時中斷子程序： ORG 0100H TIME: PUSH A SETB SETB MOV P0, 0FFH MOV A, P0 MOV B, 10 MUL AB MOV A, 210 CLR C` SUBB A, B MOV B, 10 DIV AB SWAP A ADD A, B CJNE A, R7, CON CON: JNC STOP SETB SJMP TIMEEND STOP: CLR TIMEEND: POP A RETI END 外文文獻 蘇州大學本科生畢業(yè)設(shè)計（論文） 34 Temperature Control Using a Microcontroller: An Interdisciplinary Undergraduate Engineering Design Project James S. McDonald Department of Engineering Science Trinity University San Antonio, TX 78212 Abstract This paper describes an interdisciplinary design project which was done under the author’ s supervision by a group of four senior students in the Department of Engineering Science at Trinity University. The objective of the project was to develop a temperature control system for an airfilled chamber. The system was to allow entry of a desired chamber temperature in a prescribed range and to exhibit overshoot and steadystate temperature error of less than 1 degree Kelvin in the actual chamber temperature step response. The details of the design developed by this group of students, based on a Motorola MC68HC05 family microcontroller, are described. The pedagogical value of the problem is also discussed through a description of some of the key steps in the design process. It is shown that the solution requires broad knowledge drawn from several engineering disciplines including electrical, mechanical, and control systems engineering. 1 Introduction The design project which is the subject of this paper originated from a realworld application. A prototype of a microscope slide dryer had been developed around an OmegaTM model CN390 temperature controller, and the objective was to develop a custom temperature control system to replace the Omega system. The motivation was that a custom controller targeted specifically for the application should be able to achieve the same functionality at a much lower cost, as the Omega system is unnecessarily versatile and equipped to handle a wide variety of applications. 蘇州大學本科生畢業(yè)設(shè)計（論文） 35 The mechanical layout of the slide dryer prototype is shown in Figure 1. The main element of the dryer is a large, insulated, airfilled chamber in which microscope slides, each with a tissue sample encased in paraffin, can be set on caddies. In order that the paraffin maintain the proper consistency, the temperature in the slide chamber must be maintained at a desired (constant) temperature. A second chamber (the electronics enclosure) houses a resistive heater and the temperature controller, and a fan mounted on the end of the dryer blows air across the heater, carrying heat into the slide chamber. This design project was carried out during academic year 1996– 97 by four students under the author’ s supervision as a Senior Design project in the Department of Engineering Science at Trinity University. The purpose of this paper is to describe the problem and the students’ solution in some detail, and to discuss some of the pedagogical opportunities offered by an interdisciplinary design project of this type. The students’ own report was presented at the 1997 National Conference on Undergraduate Research [1]. Section 2 gives a more detailed statement of the problem, including performance specifications, and Section 3 describes the students’ 蘇州大學本科生畢業(yè)設(shè)計（論文） 36 design. Section 4 makes up the bulk of the paper, and discusses in some detail several aspects of the design process which offer unique pedagogical opportunities. Finally, Section 5 offers some conclusions. 2 Problem Statement The basic idea of the project is to replace the relevant parts of the functionality of an Omega CN390 temperature controller using a customdesigned system. The application dictates that temperature settings are usually kept constant for long periods of time, but it’ s noheless important that step changes be tracked in a “ reasonable” manner. Thus the main requirements boil down to 178。 allowing a chamber temperature setpoint to be entered, displaying both setpoint and actual temperatures, and 178。 tracking step changes in setpoint temperature with acceptable rise time, steadystate error, and overshoot. Although not explicitly a part of the specifications in Table 1, it was clear that the customer desired digital displays of setpoint and 蘇州大學本科生畢業(yè)設(shè)計（論文） 37 act