利用单片机、HD7279、键盘，实现计时器、倒计时器。

鉴于MCS-51系统只提供“二级中断嵌套”，提出扩展51系统中断优先级的纯软件方法。其利用51系统内建的中断允许寄存器IE和中断优先级寄存器IP，通过屏蔽字机制来实现；以C51的形式，给出这种扩展方法的函数库实现，为该方法的使用赋予友好、简洁的用户接口。-Given MCS-51 systems only provide "two interrupt nesting," expanded 51 priority system interruption of pure software. The use of 51 built-in system allows interruption Register IE and priority interrupt register IP, through word shielding mechanisms to achieve; C51 in the form of this expansion is the way to achieve functions, methods for the use of empowerment friendly, simple user interface.

LT_1B msp430开发板例子程序－SoftwareF-LT_1B msp430开发板例子程序－SoftwareFLL

WAVE6000 编写的AT24C02驱动 用于掉电数据保护-WAVE6000 prepared for the Application of AT24C02 drive for data protection

Proteus VSM Nokia 3310 LCD model with test design

嵌入式系统已经广泛应用于各个科技领域和日常生活的每个角落，由于其本身的特性，使得我们很难发现它的存在。甚至一些从事嵌入式系统开发的科技人员也只知单片机，不知道嵌入式系统。本节从嵌入式系统的定义开始，阐述嵌入式系统的含义、特点等，以使读者加深对嵌入式系统的理解。 -Embedded systems are widely used in various fields of science and technology and everyday life in every corner, due to its own characteristics, making it very difficult for us to discover its existence. Embedded systems and even some involved in the development of scientific and technical personnel are also only single-chip, embedded systems do not know. This section from the beginning of the definition of embedded systems, embedded systems on the meaning, characteristics and so on, in order to enable readers to deepen their understanding of embedded systems.

8051单片机控制LED实现流水灯循环显示-8051 to achieve flow control LED lights cycle show

ISD2560发音程序，经测试比较完全。可实现录放音功能。-ISD2560 pronunciation procedures, the comparison is totally tested. Music playback function can be realized.

使用串口通信和汇编控制单个步进电机，串口部分可以使用串口调试助手-The use of serial communication and the compilation of a single stepper motor control, serial port can use the serial debug some assistants

protel元器件TQFP-44封装。做好的封装，可以直接用于PCB的绘制！-protel components TQFP-44 package. Do a good job of packaging, can be directly used for PCB drawing!

单片机做的小键盘，单片机模拟ps2接口的程序-Singlechip make a small keyboard, single-chip analog interface procedures ps2