Abstract
The single-chip microcomputer, collects CPU, RAM, ROM, the counting and many kinds of connections in a body. It has been published since the 70's of 20th century and has high performance, so it attracts lots of people’s attention.Its volume is small，the weight is light，the capacity of resisting disturbance is strong，the environmental challenge is not high，the price is not expensive and the development is easy,for that,it is widely used in the intelligent production and the industrial automation.with the technological development and social progress, people are demanding more and more digital clock high, whether in the performance of multi-function digital clock or in the style of both undergone a qualitative change. Therefore, this system uses the microcontroller as the core controller, digital clock, read clock chip value and the value coming from temperature sensors and displayed through the display, and that the circuit to the microcontroller through the implementation of key signal, the initial value assigned to the clock chip , set the alarm clock. Using AT89S52 microcontroller as a master clock module selected as a clock chip DS12C887, display module selection LCD1602, part of the selection button to set the circuit.
Keywords: single-chip Microcomputer Digital Clock clock chip DS12C887 Pin LCD1602
