2.2.4 时钟震荡电路··································9
2.3 七段数码管的引脚图及使用···························10
2.4 驱动器 74LS245 芯片·································11
三、单片机数字时钟的程序设计···························12
3.1 系统开发环境、汇编语言······························12
3.1.1 系统开发环境·································12
3.1.2 汇编语言·····································12
3.2 数字时钟设计的思路及流程···························14
3.2.1 主程序·······································14
3.2.2 定时中断(走时)子程序流程···················15
3.2.3 按键调试子程序·······························16
3.3 定时器、计数器功能·································16
3.4 中断系统功能·······································18
四、数字时钟系统的仿真及运行··························19
4.1 WAVE6000 仿真软件介绍······························19
4.2 程序设计及运行结果·································21
4.2.1 数字时钟源程序·······························21
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