说明：  用51单片机做的简单频率计,KEIL C环境,带工程文件,可直接编译运行.主要演示如何在内存很少,无法启用RTOS的单片机(例如2051)中使用状态机和时间片来完成实时多任务并行处理.例子中对键盘,信号采集和LED数码管的显示三部分进行了并行处理,而采用的单片机是仅有256字节内存2K ROM的89C2051.
(51 Singlechip to do with a simple frequency meter, KEIL C environment, with project file can be directly compiled to run. The main demonstration of how little memory, can not be enabled MCU RTOS (eg 2051) the use of state machine and the time slice to complete the real-time multi-task parallel processing. examples of the keyboard, signal acquisition and digital tube LED display of the three parts of a parallel processing, which is only used in single-chip 256-byte of the 2K ROM memory 89C2051.)