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

整有效。中间四个字节分别代表设备的地址、指令类型、指令参数1(OPT1)和指令参数2(OPT2)。设备在对这四个字节的内容进行译码后执行相应的操作

可以对microchip的Keeloq编码IC：hcs300-301解码的源程序-Keeloq the microchip can be encoded on the IC: hcs300-301 of the source decoder

这是一个基于8051单片机的用c语言写的一个时钟程序，个人原创哦-This is a 8051 based on the use of c language program written in one clock, personal original Oh

这是一篇关于嵌入式系统的LCD液晶驱动程序的资料及源程序-This is an embedded system on the LCD driver and source of information

基于单片机c8051F020的串行口通信的源程序代码。 -C8051F020 based on single-chip serial port of the source code of communication.

I2c如 IIc 24LC64等器件的51单片机驱动程序,已经通过实际验证,很好用的-I2c such as IIc 24LC64 51 microcontroller device driver, has been through actual test Oh good use

两位数码管动态显示，两个按钮可使数码管数字调大调小-Two digital tube dynamic display, two buttons will enable the digital tube digital transfer major small

MAX197子程序,实现12位AD转换,高精度高速转换

该文档包含了基于c8051f020的各种源码，包括AD、DA，串口，定时器，IIC以及时钟键盘等，很具有学习意义-This document contains a variety of source-based c8051f020, including AD, DA, serial port, timers, IIC and clock keyboard, it is with learning the meaning