本文件是用51单片机设计电子琴的资料文件，且带有原理图

基于单片机c8051f020的模数转换，数模转换应用实例-C8051f020 based on single-chip analog-to-digital conversion, digital-to-analog converter application

一个用C51编写的倒计时程序，可通过PC传送起始时间，也可回传当前时间。比较简单-C51 with a countdown of the preparation process, through PCs starting time, but also back- the present time. Relatively simple

基于51单片机的数字钟程序，实现了闹铃校时两个功能，用Keil C编写-SCM digital clock procedures, the alarm function of two schools, with the preparation of Keil C

RTC芯片，ds1302的芯片驱动程序，-RTC chip, ds1302 chip driver

RTL8019中文数据手册，不是原创，转载而已，不过内容不错！-RTL8019 Chinese manual data is not created, reproduced it, but the contents Yes!

80196的实时时钟的程序，没其他的东西可以说了！-80,196 real-time clock procedures, no other thing can be said!

arm(44b0)端口初始化,在程序里面有较多的注释部分, 在具体情况下可用-arm (44b0) port initialization, the procedure has more notes inside part can be used in specific circumstances

Point RTOS 主要是一个针对小系统开发而设计的实时操作系统。 目前，Point RTOS 仅提供对51系列及其扩展系统单片机的支持， 针对51内核函数不能重入以及51单片机的内存空间管理方式等因素， RTOS放弃了抢先式内核的调度，而使用了时间片的调度方式，除非任务主动放弃， 否则任务将独占CPU一直运行，因而任务中必须完成对本次操作的时间片设置，即等时间的设置。-Main Point RTOS is a small system development and design of real-time operating system. At present, Point RTOS only provide for 51 series and its expansion of the system single-chip support for 51 core function should not re-entrant, as well as 51 single-chip memory space management and other factors, RTOS abandoned preemptive kernel scheduling, the use of a scheduling time slice manner, unless voluntarily chose to abandon the mission, or mission will be exclusive CPU has been running, which must be completed in the mission of this operation time slice settings, that is, the time settings.

此源码基于MAX1898实现智能充电器，可以借鉴-MAX1898 Intelligent Charger, we can draw on

周立功的SD卡源代码,请大家参考,希望对大家有所帮助,-Week Ligong the SD card source code, please refer to, and they hope to be helpful to everyone,