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时钟程序,适用于80c51单片机的开发学习，代码简单易懂！可移植性强！-time

MCS-51单片机有5个中断源，其中两个是由-INT0、-INT1引脚输入的外部中断源；另外三个是内部中断源即由T0、T1的溢出引起中断和串行口发送完一个字节或接收到一个字节数据引起中断。触发外部中断有两种方式，即下降沿引起中断或低电平引起中断。当编程TCON中的ITi（i=0、1）为1时，则引起触发的方式为边沿触发方式，反之(ITi=0)为低电平触发方式。每个中断源的中断请求能否得到响应要受两级“开关”的控制，即一个总“开关”-MCS-51 single-chip has five interrupt sources, two of which are by-INT0,-INT1 pin input external interrupt source the other three internal interrupt sources from the T0, T1 overflow caused by the disruption and serial port sending or receiving end of a byte to a byte of data caused by interruption. Triggered external interrupt has two modes, namely, falling edge or low-level disruption caused disruption caused. When programming TCON in ITi (i = 0,1) for the 1:00 has been the subject of a way to trigger the way to the edge of the trigger, on the contrary (ITi = 0) for low-level trigger mode. Each interrupt source interrupt request can be subject to levels in response to

基于C51单片机的温度测量采用DS18B20的原理，详细介绍了DS18B20的使用。

mifare 读卡器weigant输出有kei uvision打开！-MIFARE reader weigant output is Kei uvision open!

HT44780 液晶显示驱动 里面有简单 程序和说明-HT44780 driver inside the liquid crystal display has a simple procedure and description

MCS51和ch375b做USB主机同普通键盘的通信-MCS51 and ch375b to do with an ordinary keyboard USB host communication

多路数据采集 +lcd +菜单功能显示 max485通信-Multi-channel Data Acquisition+ Lcd+ Menu features show MAX485 communication

详细地列举了芯片封装的发展历史。可作趣味性了解。-detailed list of chip packaging development history. For fun understanding.

51单片机定时器计算工具，对于经常使用定时器的编程者很有用的-51 Single-chip timer calculation tool, often used for programmers timer useful

座机电话短信发送源代码，座机按键号码获取，以及分类应用！-ace telephone messages this source code, ace number keys acquisition, classification and application!