Based on the design of electronic SCM Abstract: In recent years， with computer penetration in the social sphere and the development of large-scale integrated circuits， MCU applications are constantly deepening， as it has a function of strong， small size， low power consumption， cheap， reliable， Easy to use， and other characteristics， and therefore particularly suited to control the system， more widely used in automatic control， intelligent instruments， meters， data acquisition， military products and household appliances， and other fields， the MCU is often as a core Parts to use， in accordance with specific hardware and application-specific characteristics of the object with software to make This is done in electronic form SCM (AT89S51) as the core， the combination of related components (of cathode LED digital display， BCD-latch / 7 of the decoder， and so on)， Coupled with the corresponding software， to achieve Clock calendar shows that the function of the calendar also calculated， display and the clock， the calendar of calibration， and multi-channel Kaiguandingshi output， and other functions， some of its hardware components is difficult choice， layout and Key words: SCM AT89S51 a total of cathode LED digital display BCD-latch / 7 of the decoding
