Application of Real Time Clock DS14285 in Timing Control System

DS14285 is a parallel RTC chip of 8 bits.The chip adopts the multiplexed address/data bus to realize the efficiency of the pin.Besides its ability to offer time and alarm clock function to users,it also has automatic backup supply function and user RAM of 114 bytes so that the time and user's information cannot be lost during power failures.It offers three interruptions.They are separately software-maskable and testable,including the periodic interrupt,the alarm interrupt and the update-ended interrupt.The user can setup and distinguish operation states through operation of four control registers.A timing control system based on DS14285 and SCM was used,and the hardware structure and software scheme were given.