Single-chip micro-computer computer-chip (Single-Chip Microcomputer), is a CPU, RAM, ROM, timing, counting and multiple interfaces in one microcontroller. In recent years, with the field of computer penetration in the community and the development of large-scale integrated circuits, single-chip applications is steadily moving toward depth and 51 single-chip single-chip is the most typical and most representative one. Because of its strong functions, small size, low power consumption, cheap, reliable and easy to use and so on, it is particularly suited to control systems and, more widely used in automatic control, intelligent instruments, meters, data acquisition, military products, as well as household appliances and other fields, often single-chip microcomputer as a core component to use, in accordance with the specific hardware architecture, as well as application-specific features of the software object to be perfect. The graduation project through its study and application to achieve the study, design, development hardware and software capabilities. With a variety of computer-axis of the birth of information processing devices, in order to adapt to this new situation, information appliances, network terminals, radio - communications, such as the use of LCD market will expand rapidly, and now not only the development direction of LCD to the big screen, but also in small and medium-sized screen, such as car navigation systems, video cameras, digital cameras, portable TV, PDA (Personal Digital Assistant), entertainment / video game consoles, cameras, etc. have further development. Liquid Crystal Display (LCD) with low power consumption, small size, light weight, ultra-thin displays and many other advantages unmatched in recent years been widely used in single-chip smart control devices, instrumentation and low-power electronic products. LCD can be divided into Segment LCD, character-type LCD and dot matrix LCD. Among them, the piece character LCD and LCD-style characters and figures can only be used for simple display, can not satisfy the graphics curve and show that the requirements of Chinese characters; and dot-matrix LCD can display characters, numbers, can also display a variety of graphics, curve as well as Chinese characters, animation, and can scroll the screen, reverse, blinking and other functions, a wide range of uses. This article describes the design of single-chip microcomputer AT89C52 combination 74LS244 clock timing of the program controller. 74LS244 tri-state output for the eight sets of buffers and bus drivers. AT89C52 single-chip microcomputer of the system will read out the internal clock and through the seventh four-in-one digital tube (LED) display, through the button to set the alarm to change the system time, single-chip based on the time to set alarm alarm processing, thus realizing the intelligent system. The system is a function of timing and control products, according to the different needs for various occasions.
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