基于单片机的计算器原程序代码，传上去让大家看看！

P89C52对SJA1000的经典设计 使用了ZLG的隔离收发一体芯片 不可错过！-P89C52 of SJA1000 classic design uses isolation ZLG transceiver chip not to be missed!

HT93LC46EEPROM 是Holtek 制造的1K 位系列的EEPROM（电子可擦除只读存储器），一般 它用于微控制器的固定数据的存储。在本文中，我们将以Holtek 公司8 位微控制器HT49 系列为例，介绍该芯片常用的操作功能代码。用户只需把代码加到程序中，并且在使用HT93LC46 之前将引脚CS/SK/DI/DO 连接即可。-HT93LC46EEPROM is a 1K-bit Holtek manufactured series of EEPROM (electronic erasable read-only memory), general micro-controller is used to store fixed data. In this article, we will Holtek" s 8-bit microcontroller HT49 series, for example, the introduction of the chip code commonly used operating functions. Users simply add the code the program, and before the use of HT93LC46 pin CS/SK/DI/DO connection is needed.

在做项目（工程）的时候，我们经常要用到比较多的按键，而且IO 资源紧张， 于是我们就想方设法地在别的模块中节省IO 口，好不容易挤出一两个IO 口，却 发现仍然不够用，实在没办法了就添加一个IC 来扫键。一个IC 虽然价格不高， 但对于大批量生产而且产品利润低的厂家来说，这是一笔不菲的开支! 那，我们能不能想到比较好的扫键方法：用最少的IO 口，扫最多的键？可以吗？-Doing the project (engineering), we often use the relatively large number of keys, and the IO resource constraints, so we are trying to save in another module IO ports, finally out of one or two IO ports, only to find is still not enough there is really no other way to add an IC to sweep on the keys. Although the price of an IC is not high, but low profits, high-volume production and product manufacturers, this is spending a lot of money! That, we can not think of a better scan key method: with a minimum of IO ports, scan Most of the keys? OK?

uIP运行于8位-16位单片机上TCPIP协议源码0.9　　我自己做过的　很好的　希望与大家爱好者分享-Application of ulP runs on eight 16-bit microcontroller agreement on the source of 0.9 TCPIP I done good and we hope to share lovers

nrf24e1的有关UART的驱动程序，与电脑上的串口辅助调试工具配合使用-nRF24E1 relevant UART driver, and computer-assisted debugging tools for serial port used in conjunction

一种能产生宽调节占空比的PWM芯片，适合做逆变电源。-Can generate a duty cycle of the PWM chip width adjustment, suitable for power inverters.

ok very good os

TD7774A型

AT89S52串口多字节接收,可以接收任意字节.-AT89S52 serial multi-byte reception, can receive any bytes.

providing learners for programming with C51, and joining in these web,hopefully finding people with C51 programming so that it will can be studied each other.-providing learners for programming with C 51, and joining in these web, hopefully finding people with C51 programming so that it will can be studied each other.