X25045为看门狗专用芯片，很常用，也很实用，尤其对小系统非常值...

C51的4×3键盘、LED数码显示、串行通讯-C51 4 3 keyboard, LED digital display, serial communications

keil软件指南，对keilc51软件的安装、操作程序进行了详细的调试。对基尔初学者很有帮助

红外通讯，能够通过红外线接收和发送数据，性能可靠-Infrared communication, through infrared receiving and sending data, reliable performance

VGA视频2*2分配器图纸，protel 99制作。 -VGA Video 2* 2 Distributor drawings, Protel 99 production.

DTMF编码芯片HT9200的51接口程序。输入参数R2表示发送数据个数，输入数据与发送数据与DTMF码的关系:00H-0 01H-1 02H-2 03H-3 04H-4 05H-5 06H-6 07H-7 08H-8 09H-9 0AH-A 0BH-B 0CH-C 0DH-D 0EH-* 0FH-#。详细说明参考文件内-DTMF encoder chip HT9200 51 interface program. R2 said input parameters to send data distribution, data entry and send data with the DTMF code : 00H-0 01H- 02H-2 Mr- 3 in the 04H-4 05H-5 06H-6 07H-7 08H-8 7-9 0AH-A 0BH- 0CH B-C 0DH-D 0EH-* 0FH-#. Detailed information paper

t5557 中文数据手册 t5557 中文数据手册-t5557 datasheet

一些LCD库 分享给大家了 哈哈~-LCD library share some of the U.S. ha ha ~

pic单片机c口的控制 单片机相应的I/O口设置为输出口，输出高电平时LED点亮，反之，LED不亮。利用软件延时的办法实现05S延时，实现LED流水灯的效果。-pic Singlechip c I control the corresponding single-chip I/O port set to output, the output high when the LED light, on the contrary, LED does not shine. Approach to the use of software latency delay 05S realize, realize LED lights flowing effect.

通过ＭＣＵ采集数据并上传到ＰＣ，通过串口协议传送-Through the MCU data collection and upload to the PC, through serial transmission agreement

用89C2051实现AD转换的C51程序-with 89C2051 AD conversion procedures C51