说明：  新华龙c8051的布局布线设计原则，文中详细讲述了模数混合电路板的布局布线策略；电源旁路电容的选型方案；输入输出接口的保护方法。对初学pcb布线的新手很有帮助。
(New Hualong C8051, layout design principles, in detail about the strategy of mixed analog-digital circuit board layout supply bypass capacitor selection program methods of protection of the input and output interfaces. The novice beginner PCB wiring is helpful.)