在屏幕上开出三个窗口：起止坐标为（5，10）和（15，30），（5，50）和（15，70），（18，15）和（22，65）。要求可用左右方向键选择左窗口或右窗口

汇编中调用钩子函数的例子。-compilation called hook function examples.

PC机的串口收发软件　！！！C语言 PC机的串口收发软件　！！！C语言-PC serial port transceiver software! ! ! C language PC serial port transceiver software! ! ! C language PC serial port transceiver software! ! ! C Language

4*4键盘扫描，依据键值，8个LED显示相应键值-4* 4 keyboard scanning, based on keys, 8 LED display the corresponding key

汉诺塔设计，希望对大家有用，请大家多多指教。-Hanoi Tower design, we hope to useful, please exhibitions.

在电子技术中，频率是最基本的参数之一，又与许多电参量的测量方案、测量结果都有十分密切的关系，因此频率的测量就显得更为重要。测量频率的方法有多种,其中电子计数器测量频率具有精度高、使用方便、测量迅速，以及便于实现测量过程自动化等优点，是频率测量的重要手段之一。在本次毕业设计中我们选择使用单片机来制作数字频率计，并在实际制作中采用了直接测频法。利用延时产生的时基门控信号来控制闸门，通过在单位时间内计数器记录下的脉冲个数计算出输入信号的频率，最终送入LCD中显示。这样制作出来的频率计不仅可以满足设计题目的参数要求，而且具有了单片机的稳定性和成熟性，且控制能力强，是一种低成本，高可靠的设计方案。-In electronic technology, the frequency is one of the most basic parameters, but also with a number of electrical parameters of the measurement program, the measurement results have a very close relationship between the frequency of measurement, therefore it is even more important. Measurement of the frequency of a number of means, electronic measurement of the frequency counter with high precision, easy to use, rapid measurement, and measurement is easy to realize the advantages of process automation is an important means of measuring the frequency of one. Graduates in this design we have chosen to make use of single-chip digital frequency meter, and used in the actual production of a direct

A/D转换子程序，根据单片机的读写时序以及其丰富的I/O接口，利用汇编编程，实现模-数转换功能。-A/D conversion subroutine, in accordance with the read and write single-chip timing, as well as its wealth of I/O interface, using the compilation of programming, to achieve mold- digital conversion function.

PCF8574的数据移出移入总线的数据读写 PCF8574的数据移出移入总线的数据读写-The data out of the bus PCF8574 moved into the data read and write the data out of the PCF8574 moved into the data bus read and write

基于51单片机实现一个用蜂鸣器唱歌的程序，适合与初学者使用-Based on 51 MCU buzzer to sing with a program suited to beginners

温度传感器的C51源程序，可使用keil直接编译执行。-temperature sensor C51 source can be used directly keil compiler implementation.

HPA磁盘隐藏分区的安装生成源码，在MASM编译上可以通过，主要调用BIOS中断，端口等实现操作。-HPA hidden disk partition to install to generate source code in MASM compiler can be passed, the main BIOS interrupt call, port and so realize the operation.