Thesis number: JD873 includes opening report, task book and foreign language translation. Thesis words 16608, with 37 pages. This design takes AT89C205 1 chip as the core, supplemented by necessary peripheral circuits, and designs a simple digital electronic clock, which is powered by 5V DC power supply. In terms of hardware, in addition to CPU, four seven-segment LED digital tubes are used for display. Led is dynamically scanned and driven by 90 14 chip. By debugging the LED, the time and minutes can be displayed more accurately. Three simple buttons can adjust the time. The software is written in assembly language. The whole electronic clock system can complete the functions of time display, time adjustment, timed alarm and reset.

In terms of software, the assembly language is used to program, and online programming is carried out by using SLISP software, which involves the use of timing and interrupt of single chip microcomputer.

Keywords: single chip microcomputer; Temperature display; SLIS

Based on the design of AT89C205 1 chip and the necessary peripheral circuits, a simple digital clock is designed, which is powered by 5V DC. In terms of hardware, in addition to CPU, four LEDs and seven segments of LED display are adopted, and the dynamic scanning display of LEDs is adopted, and the 90 14 driver chip is adopted. Hours and minutes can be displayed by more accurate debugging of LED. Three simple keys to adjust the time. The software is programmed in assembly language. The whole electronic clock system completes the functions of display, transmission, timing clock and reset.

The software is programmed in assembly language, and the online SLISP software programmer program is used, which involves the use of single chip microcomputer timing and interrupt.

Keywords: single chip microcomputer; Temperature; Display; SLIS summary

Directory 3

1 Introduction 4

1. 1 Preface 4

1.2 classification of digital electronic clocks 4

1.2. 1 NE555 time base circuit 4

1.2.2 special chip for quartz clock 4

1.2.3 Microprocessor 5

1.2.4 Multisim2001Pin of Software Part Integrated Block Figure 5

1.3 Basic functions and design requirements of digital electronic clock 6

2 hardware principle of digital electronic clock 6

2. 1 digital electronic clock design scheme 6

2. 1. 1 at89c 205 1 CPU 6

2. 1.2 key circuit 6

2. 1.3 clock display circuit 7

2.2 Hardware composition of digital electronic clock 7

2.3AT89C205 1 MCU Description 7

2.4 Hardware System of Digital Electronic Clock 8

2.4. 1 hardware system framework of digital electronic clock 8

2.4.2 Host Circuit of Digital Electronic Clock 9

System clock circuit 9

System reset circuit 9

2.4.5 Timing indication circuit 10

2.4.6 key circuit 10

2.4.7 display circuit of digital electronic clock 1 1

2.4.8 power supply 12

2.5 schematic diagram of hardware circuit 13

Composition principle of digital electronic clock 15

3. 1 main module 15

3.2 display module 16

3.3 The current edit bit flashes 18

3.4 Time Setting Module 19

3.5 seconds signal generation and propagation time 20

Functions of 3.6 12 hour system and 24-hour system 2 1

3.7 Timing function 2 1

3.8 Program Based on Assembly Language 22

3.9 Data Adjustment 24

4 system assembly and debugging 25

4. 1 hardware system assembly and debugging 25

4.2 Software System Debugging 26

5 Abstract 26

Reference 28

Acknowledgement 29

Appendix A 30

Appendix B 33 The above answers come from: /html/42/