There is a 4X4 matrix keyboard schematics and procedures, helpful

Port串行通信-Port Serial Communication

金鹏电子出产的液晶ocm4x8b源代码，基于51单片机的，如果其他控制器请修改。-Jinpeng Electronics LCD ocm4x8b produced the source code, based on the MCU 51, if the other controller requested the modification.

24c02存储小时钟程序，很好的小电子制作-24c02

在CVAVR平台上用Atmega16实现对实时时钟芯片8563的读写控制-In ATmega16 with CVAVR platform to achieve real-time clock chip on the 8563 reading and writing control

430学习例子！很好用的！-430 learning example! The good!

here is the calculator for 8051 for timing an dboud rate genartion .. it will be very helpful for calculation

用DriverStudio开发一个USB驱动程序的过程。《10分钟完成一个USB驱动程序》

Avr Serial Port Communication

COBS-consistent overhead byte stuffing，一种串行通信字节流packetize的算法，在PPP和HDLC串行通信中均有用，笔者把它用在单片机串行通信程序中，非常成功。包中的两个工程阐释了算法原理。pdf文档进一步作了说明。-COBS-consistent overhead byte stuffing, a serial communication byte stream packetize algorithms, in the PPP and HDLC serial communications are used, the author put it in single-chip serial communication program, very successful. Package the two projects to explain the principle of the algorithm. pdf document for further clarification.

stm32s103使用诺基亚液晶5110组成显示系统，用于开发廉价经济的单片机系统。诺基亚液晶5110采用SPI接口，只有5根IO口，可以节省单片机资源。