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[biyesheji_huibian.rar]- Based on MCS-51 single chip digital clock design [Abstract] III [ABSTRACT] IV INTRODUCTION 1 1 Introduction 2 1.1 IC 2 1.2 key technical background 2 1.2.1 Current Situation 1.2.2 Development history 2 3 1.2.3 Development Trend 3 2 Introduction 4 2.1 LED devices display 4 2.1