基于51单片机的英文论文.docVIP

the Real-Time Clock Based on AT89S51 Author: Class: ; Name: Abstract: Digital clock has become indispensable in peoples daily life, it is widely used in public places such as the family and the office, and it gives people great convenience in study, work and entertainment. Due to the development of digital integrated circuit technology and the advanced quartz technology, the digital clock has advantages of accurate, stable performance and easy to carry. It is also used in automatic control, automatic signal and etc. Although the digital clocks are already sold on the market, but the single chip microcomputer timer function also can complete the design of the digital clock circuit. So it is necessary to the design of the digital clock. By single chip microcomputer internal timer timing precision, the four digital tube display year, month, day, time, minutes and seconds. With the keyboard, users can be preset time, display the time, set the content, set time operation mode, etc. Keywords: AT89S51; clock; digital tube; keyboard switch; function Introduction: AT89S51 is a very suitable for the beginners of the single chip microcomputer, it is fully compatible with the traditional instruction system of 8051,8031. Can realize the following functions: 1. Use the keyboard switch, show respectively the seconds, minutes, hour, day, month, year; 2. Use the keyboard preset year, month, day, time, minutes and seconds; 3. Can the countdown, the countdown units for minutes; 4. Every second , the four decimal point shine once; 5. Timing alarm clock function, a buzzer call reminder. 6. The clock error daily is not more than 1 second. Methods: The minimum single chip microcomputer system AT89S51 has the following standard functions: 8 k bytes Flash, 256 bytes RAM, and 32-bit I/O lines, a watchdog timer, two data pointer, three 16 timer/counter, a level 6 vector 2 interrupt structure, full duplex serial port, piece of crystals and the clock circuit . In idle mode, the CPU stops