【正文】 CONT_1=0。 b=a。 conversion(b)。 baojing (b)。 } }}//***************************************************************//外部中斷0，用做判斷回波電平INTO_() interrupt 0 // 外部中斷是0號 { outeH =TH1。 //取出定時器的值 outeL =TL1。 //取出定時器的值 succeed_flag=1。 //至成功測量的標志 EX0=0。 //關閉外部中斷 }//****************************************************************//定時器0中斷,用做顯示timer0() interrupt 1 // 定時器0中斷是1號 { TH0=0xfd。 //寫入定時器0初始值 TL0=0x77。 switch(flag) { case 0x00:P0=ge。 p2_0=0。p2_1=1。p2_2=1。flag++。break。 case 0x01:P0=shi。p2_0=1。p2_1=0。p2_2=1。flag++。break。 case 0x02:P0=bai。p2_0=1。p2_1=1。p2_2=0。flag=0。break。 } }//*****************************************************************//******************************************************************//顯示數(shù)據轉換程序void conversion(uint temp_data) { uchar ge_data,shi_data,bai_data 。 bai_data=temp_data/100 。 temp_data=temp_data%100。 //取余運算 shi_data=temp_data/10 。 temp_data=temp_data%10。 //取余運算 ge_data=temp_data。 bai_data=table[bai_data]。 shi_data=table_d[shi_data]。 ge_data =table[ge_data]。 EA=0。 bai = bai_data。 shi = shi_data。 ge = ge_data 。 EA=1。 }//******************************************************************//延時程序void delay_20us() { uchar bt 。 for(bt=0。bt100。bt++)。 }//***************************************************************//報警程序void baojing (int f){ BAO=0 。 if(f120) { BAO=1 。 DENG=0。 } else{ BAO=0 。 DENG=1。 }}系統(tǒng)仿真圖58英文資料翻譯AT89C2051 Microcontroller InstructionsFrom a simple heritage, these remarkable systems have evolved to not only replace electromechanical devices, but to solve an everincreasing array of control problems in both process and nonprocess industries. By all indications, these microprocessor powered giants will continue to break new ground in the automated factory into the 1990s. HISTORY In the 1960s, electromechanical devices were the order of the day ass far as control was concerned. These devices, monly known as relays, were being used by the thousands to control many sequentialtype manufacturing processes and standalong machines. Many of these relays were in use in the transportation industry, more specifically, the automotive industry. These relays used hundreds of wires and their interconnections to effect a control solution. The performance of a relay was basically reliable at least as a single device. But the mon applications for relay panels called for 300 to 500 or more relays, and the reliability and maintenance issues associated with supporting these panels became a very great challenge. Cost became another issue, for in spite of the low cost of the relay itself, the installed cost of the panel could be quite high. The total cost including purchased parts, wiring, and installation labor, could range from $30~$50 per relay. To make matters worse, the constantly changing needs of a process called for recurring modifications of a control panel. With relays, this was a costly prospect, as it was acplished by a major rewiring effort on the panel. In addition these changes were sometimes poorly documented, causing a secondshift maintenance nightmare months later. In light of this, it was not unmon to discard an entire control panel in favor of a new one with the appropriate ponents wired in a manner suited for the new process. Add to this the unpredictable, and potentially high, cost of maintaining these systems as on highvolume motor vehicle production lines, and it became clear that something was needed to improve the control process to make it more reliable, easier to troubleshoot, and more adaptable to changing control needs. That something, in the late 1960s, was the first programmable controller. This first ‘revolutionary’ system wan developed as a specific response to the needs of the major automotive manufacturers in the United States. These early controllers, or programmable logic controllers (PLC), represented the first systems that 1 could be used on the factory floor, 2 could have there ‘logic’ changed without extensive rewiring or ponent changes, and 3 were easy to diagnose and repair when problems occurred. It is interesting to observe the progress that has been made in the past 15 years in the programmable controller area. The pioneer products of the late 1960s must have been confusing and frightening to a great number of people. For example, what happened to the hardwired and electromechanical devices that maintenance personnel were used to repairing with hand tools? They were replaced with ‘puters’ disguised as electronics designed to replace relays. Even the programming tools were designed to appear as relay equivalent presentations. We have the opportunity now to examine the promise, in retrospect, that the programmable controller brought to manufacturing. All programmable controllers consist of the basic functional blocks shown in Fig. 10. 1. We’ll examine each block to understand the relationship to the control system. First we look at the center, as it is the heart ( or at least the brain ) of the system. It consists of a microprocessor, logic memory for the storage of the actual control logic, storage or variable memory for use with data that will ordinarily change as a function power for the processor and memory. Next es the I/O block. This function takes the control level signals for the CPU and converts them to voltage and current levels suitable for connection with factory grade sensors and actuators. The I/O type can range from digital (discrete or on / off), analog (continuously variable), or a variety of special purpose ‘smart’ I/O which are dedicated to a certain application task. The programmer is shown here, but it is normally used only to initially configure and program a system and is not required for the system to operate. It is