based on MCS-51 microcontroller design of the digital clock III [Abstract] [ABSTRACT] IV INTRODUCTION Introduction 2 1 1 2 1.2 1.1 IC main technical background history 1.2.1 2 2 1.2. 1.2.3 Situation 2 3 3 2 trends Device Profile 4 2.1 4 LED Displays 2.1.1 LED Display The structure of the four 2.1.2 Connection form LED 5 2.2 5 2.2.1 Introduction AT89C52 AT8 9C52 main performance parameters : 5 2.2.2 AT89C52 outlined in the functional properties : 6 2.3 9 2.3.1 Chip DS1302 DS1302 performance characteristics : 9 2.3.2 DS1302 data operation principle 10 2.4 74LS164-8 shift register 14 74LS64 14 2.4.1 Introduction 2.4.2 74LS164 logic presentations : 15 3 17 3.1 hardware circuit design lines 17 Power Conversion Module 3.1.1 3.1.2 Main Control 18 Module Module 18 3.1.3 3.1.4 keyboard interface 19

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