The sixth issue of SRTP

此为友善之臂micro2440开发板的使用手册，更新时间是2009年2月28日。-This is a friendly arm on the development board micro2440 user" s manual, update time is February 28, 2009.

这是一个为51系列单片机开发的4*4键盘驱动程序。该驱动程序包括2个文件，使用时将C文件关联入工程，在调用文件前包含H文件即可。本键盘驱动程序具有两个接口函数提供两种扫描方式（阻塞和非阻塞），可以任意定制返回键值，具有防抖动处理，具体使用方法可以参见注释。（本程序在Keil C51开发环境中测试成功，并经过多次实践应用）。-This is a series of 51 MCU development of the 4* 4 keyboard driver. The drive included two documents, the use of paper will be linked into C, the call of documents containing H documents. The keyboard driver has two interface functions provide two scan mode (blocking and non-blocking), it will return to arbitrary custom keys with innovative and handling, the use of specific methods can be found in Notes. (This procedure Keil C51 development environment to test successful, and after several practice application).

51单片机虚拟I2C协议、组合式按键、串口通信的简单综合应用，配Proteus仿真电路-51 Single-chip virtual I2C agreement, the modular keypad, serial communications, a simple integrated application, with Proteus simulation circuit

用51单片机模拟I2C，程序已调试可以使用-51 MCU simulation with I2C, procedures can be used to debug

手把手教你学AVR单片机C程序设计实验程序-Shoubashoujiao you learn AVR Microcontroller C Programming Experimental Procedure

51单片机写的程控滤波器，是07年电子大赛的 很多功能没有实现 望高人改正-51 single-chip microcomputer program written filter, is the e-Competition in 2007 did not materialize, many functions of an expert look correct

简易数字电压表可以测量0-5V范围的8路电压值，并在4位LED数码管上轮流显示或单路选择显示。-Simple digital voltage meter can measure the range of 0-5V Voltage road 8, and 4 digital tube LED display on a rotational basis or choose to display a single road.

程控增益线性脉冲放大器的设计。 设计了一种新型程控增益线性脉冲放大器。采用准高斯CR2RC2CR 成形电路结构,使用非易失性数字电位器和精密运放,使电路结构大大简化,抗干扰能力强,增益多级连续变化平稳,且具有温漂低、脉冲线性好等特点-Programmable gain linear pulse amplifier design. Design a new type of programmable gain linear pulse amplifier. Using quasi-Gaussian CR2RC2CR forming circuit structure, the use of non-volatile digital potentiometers and precision operational amplifier, so that greatly simplify the circuit structure, anti-jamming, multi-stage continuously variable gain stable, and has a low drift, pulse linear good characteristics

采用C51编写的基于C8051F020单片机的定时器实用程序。-using C51 prepared by the C8051F020 timers utility.

8051系列变速器简介