系统采用模块化设计，主体分为计时显示模块、计分显示模块、定时报警、按键

The system is modular in design, the body is divided into time display module, the display module scoring, time alarm, control key keyboard module. Simple program structure of each module, the task clear, easy to write, debug and modify. Readability is good, modifications to the program can be carried out locally, other parts can remain unchanged. After programming using Keil uVision4 software to compile, and then generated hex file into chips, Proteus 7.8SP2 using software simulation, testing whether the function can be implemented properly, can then be drawn Altium8.3 hardware circuit. The design of the system consists of the following hardware components: with STC89C52 microcontroller, a timer circuit, scoring circuit, the alarm circuit and a key switch.

The system adopts a modular design, the main body is divided into timing display module, scoring display module, timing alarm, key control keyboard module. Each module has simple program structure, clear tasks, easy to write, debug and modify. Program readability is good, modifications to the program can be made locally, and other parts can remain unchanged. After programming, Keil uVision4 software is used to compile, and then the generated hex file into the chip, using Proteus 7.8SP2 software simulation, to verify whether the function can be achieved properly, and then use Altium8.3 to draw a hardware circuit diagram. In this design, the system hardware circuit is mainly composed of the following parts: the microcontroller STC89C52, timing circuit, scoring circuit, alarm circuit and key switch.

The system adopts modular design, the main body is divided into timing display module, scoring display module, timing alarm, key control keyboard module. The program structure of each module is simple, the task is clear, and it is easy to write, debug and modify. Program readability is good, the modification of the program can be carried out locally, and other parts can remain unchanged. After programming, Keil uvisin4 software is used to compile, and then the generated hex file is loaded into the chip. Proteus 7.8sp2 software is used to simulate, to check whether the function can be realized normally, and then the hardware circuit diagram can be drawn with Altium 8.3. In this design, the system hardware circuit is mainly composed of the following parts: SCM STC89C52, timing circuit, scoring circuit, alarm circuit and key switch.<br>