在这个实例中，模拟了按键唤醒功能。单片机通常在空闲的时候处于休眠状态，直到用户通过按键操作它时，才醒过来全速运行。另外此例讨论了编写键盘程序时的另一个重要问题：去抖动。

//硬件环境：ATmeg48 单片机，CPU时钟1MHz

//软件环境：ICC AVR6.3以上-In this case, the simulation of the wake-up function keys. Single-chip idle time usually dormant until the user through the key operation of it, only to wake up to run at full speed. Also discussed in this case, the keyboard program to prepare another important issue: to jitter.// Hardware environment: ATmeg48 single-chip, CPU clock 1MHz// Software Environment: ICC AVR6.3 more than