【正文】 ( left) shows: 9 feet for the MCU reset. The clock circuit as shown in Figure 3 ( right) shows: crystal oscillator is used in 12MHZ, XATL2 and XATL1 were 18 and 19 feet of scm. Fig. 3 overall plans 5 display circuit design This circuit uses a 8 digital tube display, from 74ls245 to drive 8 digital tube display elevator to arrive the number of floors and the operational status of the elevator, wherein the digital tube of 6 feet ( DP ) bright said elevator at this point in the uplink, if not bright said elevator in the downlink. microcontroller P2 port as the output port and the output activelow. The circuit shown in figure 4: Fig. 4 overall plans motor positive inversion of control In this design in order to facilitate the motor positive and negative use two light tube to represent, as shown in Figure 5 : the use of SCM P0 port output port to drive the luminous tube, as is the P0 to add resistance, in which L1 light indicates the motor forward, L2 lights, L3 light indicates that the motor reverse motor stop, while the elevator door. L3 out that the elevator door, elevator running L1 and L2 must have a bright, to express elevator uplink and downlink Fig. 5 overall plans 6 system software design Because the design of the keyboard matrix to replace the outgoing select button, which is the direction of the elevator call button and choose according to these keys to decide, so the chip to scan the keyboard constantly to get the call state. In order to control the operation of the lift. The keyboard matrix scanning is an important part of the software design of the system, in addition to the storage key information of each layer to keyboard scan, and then pare and elevator operation, to determine whether the response of each layer of the call ( elevator only in response to the same direction, finally call ) is floor display part, this design is through a delay circuit to display the location of the elevator. The software design includes the following sections: The initialization procedure so that the digital display 1 indicates that the elevator in a building, and the L3 light that elevator door etc. Others entered the elevator。 S15: Elevator internal selection to the five floor button, the button is pressed said elevator passengers going to the five floor, SCM according to the signal control elevator。 S13: the elevator to the third floor internal selection button, the button is pressed said elevator passengers to go to the third floor, SCM according to the signal control elevator。 S11: Elevator internal selection to a floor button, the button is pressed said elevator passengers going to the first floor, SCM according to the signal to control the operation of the lift。 S9: five floor down the call button, the button is pressed five floor elevator ride down to single chip, and the signal into a fixed unit, wait to judge whether the response to this call the elevator to the floor。 S7 : four buildings down the call button, the button is pressed four floor elevator ride down to single chip, and the signal into a fixed unit, wait to judge whether the response to this call the elevator to the floor。 S5: the third floor down the call button, the button press said the third floor has take the elevator downstairs to SCM, and the signal into a fixed unit, wait to judge whether the response to this call the elevator to the floor。 S3 : two buildings down the call button, the button press said the two floor elevator ride down to single chip, and the signal into a fixed unit, wait to judge whether the response to this call the elevator to the floor。 外文翻譯 頻率合成器設(shè)計(jì) 系 別： 電子與電氣工程系 年級(jí)專業(yè)： 2021 級(jí)電子信息工程（專升本） 姓 名： 學(xué) 號(hào)： 125031108 題目名稱： 頻率合成器 設(shè)計(jì) 指導(dǎo)老師評(píng)語： 指導(dǎo)老師簽名： 年 月 日 1 外文翻譯 The elevator controller based on Singlechip microputer Abstract: the design is based on singlechip microputer to control the use of the appliance, the use of digital tube to display the position and direction of the floor, using two LEDs to replace the motor, to achieve the motor positive inversion by singlechip microputer to control the LED on and off, to check the position of the elevator through the timer delay. Keywords: Elevator AT89S51 LED motor control floor check 1 Introduction With the rapid development of the continuous improvement of living standards and the national economy. Each big city buildings in continuously to the highlevel development. Therefore lift play a decisive role in our life. The elevator is not only the important equipment for the production process, it is a transportation equipment by the people with frequent. Therefore, the elevator control technology is also in constant improvement and perfection, monly used control technology mainly has two kinds of Technology: Based on PLC control and based on MCU control technology of two. Use the elevator PLC control, stable and reliable performance, but the cost is too high. The elevator control can greatly reduce the cost and the operation is reliable based on the elevator control, so now most controlled by single chip microputer. 2 of the overall design scheme 2 of the overall design scheme design ideas The basic idea of this design is the use of AT89s51 microcontroller as the core, to control the use of its rich interface and peripheral circuit with I/O. Check the position of the timer delay to control the elevator, using 8 bit LED static display to display the elevator location, and use 74ls245 to drive LED display. The determinant keyboard matrix as the external to internal selection circuit, because it is the 6 floor, the choice of 4 * 4 matrix keyboard. When the elevator arrived at the destination when the motor stops, the passengers can ente