基于89c52编写的电子时钟，proteus仿真成功，包含程序和仿真文件，键盘扫描及时间用到了两个时间中断，带闪烁显示-Based on the the 89c52 write the electronic clock, proteus simulation is successful, contains the procedures and simulation files, keyboard scan, and time used two time interrupts, with a fl