STC范例程序(C语言)，包括AD,串口，EEPROM，ISP,读内部RC时钟及ID号，时钟中断，端口测试程序，及优化编程思想。-STC sample program (C language), including AD, serial port, EEPROM, ISP, time and ID number of the internal RC clock, the clock interrupt, port test program, and optimize programming id