验源码。 MEGA8芯片编程的注意事项： 1）、如果晶振被编程为外部时钟，此时只有使用外部有源晶振才可重新对MEGA8进行编程。 2）、如果用户只有串行编程设备，请不要将RESET功能禁止，否则只有使用并行高压编-Test source. MEGA8 chip programming note: 1), if the crystal has been programmed for external clock, this time only using the external crystal

If you’re involved with designing or programming devices that incorporate a USB mass-storage device or host interface, this book will help you get your projects up and running. You’ll also find the book useful if you’re designing or programming

实现4阶数字锁相环,老外写的,有详细注释,如果您觉得不错,就re一下()