该源码采用标准c编写，使用SPI方式访问SD卡。

实现两个单片机的通讯，主机发送数据给从机，从机接收数据-Realize the two single-chip communication, the host sending data to the slave, to receive data from the machine

NOKIA3310显示屏中文说明，厂家中文的说明。-NOKIA3310 display Chinese that the Chinese manufacturers note.

DS18B20 c51程序（EE21学习板演示程序） -DS18B20 c51 procedures (EE21 learning demo board)

C8051F023的应用，主要功能是通过串口1读取GPS接收机信号，在有INT0的响应时，通过串口2发送。-C8051F023 applications, the main function is to read through a serial GPS receiver signal, INT0 in response, sent through the serial port 2.

pcf8563是一种实时的日历时钟芯片，它解决了计时的千年问题。-pcf8563 a real-time clock chip calendar, it has resolved a time of the Millennium problems.

本文介绍了AT89C2051单片机的性能和特点，并在分析了超声波测距原理的基本系统框图。该设计系统经校正后，其测量精度可达0.1米-This paper introduces the AT89C2051 performance and features, and the analysis of the ultrasonic distance measurement principle diagram of the basic system. The design of the system calibration, measurement accuracy of 0.1 meters

AVR硬件设计注意事项,需要在设计中注意-AVRHARDWARE DESIGN GUIDE

Woltomierz dla AVR. Przyklad jak stworzyc woltomierz na platformie AVR

用2051制作的测试1HZ到1M的频率测试C程序 -2051 produced by the test frequency of 1Hz to 1M test C program

空调遥控器编程实例，NEC单片机。-air conditioning remote control programming examples, NEC MCU.