The Microchip folks offer a free TCP/IP STACK that works very well with the PIC18F67J60. That sets Microchip up a notch in my book, as there's nothing better than a semiconductor manufacturer that offers a free support firmware package for its products. However, not every embedded Ethernet design needs DHCP or TCP capabilities. For instance, if you only need UDP, in most cases, you'll still need to load all or the bulk of the stack's underlying components which go unused and eat up your microcontroller's precious Flash and SRAM resources. About the only way around that situation is to write your own set of PIC18F67J60 drivers, and that's just what we're going to do in this spin of Design Cycle.
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机译：Microchip的人员提供了一个免费的TCP / IP STACK，可与PIC18F67J60很好地配合使用。那使Microchip在我的书中名列前茅，因为没有什么比为其产品提供免费支持固件包的半导体制造商更好的了。但是，并非每个嵌入式以太网设计都需要DHCP或TCP功能。例如，如果您仅需要UDP，在大多数情况下，您仍将需要加载堆栈中所有未使用的或大部分的基础组件，这些组件将不使用并消耗微控制器宝贵的Flash和SRAM资源。解决这种情况的唯一方法是编写自己的PIC18F67J60驱动程序集，而这正是我们在此设计周期中要做的。
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