c51用串口通信源码,包括调试 1.发送：向总线上发命令 2.接收：从总线接收命令，并分析是地址还是数据。 3.定时发送：从内存中取数并向主机发送.-decoder serial communication with the source code, including a debugger. Send : Bus made to order two. Acceptance : Bus from receiving orders and analysis of data or add

SDRAM原理及时序分析，从网络上搜集，整理成PDF，对于嵌入式应用很有作用-SDRAM timing analysis principle, from the network to collect, organize into PDF, for the very role of embedded applications