There are many different (and often confusing) terms associated with clock-based devices. This application note attempts to clarify these terms, and hence serves as a comprehensive reference on clock terminology. This application note can be divided into two sections. The first section describes and distinguishes between various clock sources available today. The second section defines and distinguishes between various parameters used to describe clocks. This section also provides methods of measuring some of these parameters.

这是52单片机串口调试程序，通过此程序，可以使单片机于PC机通信-This is the 52 single-chip serial debugging process, through this program will enable single-chip communication to the PC

用AT89S51单片机实现LCD1602显示数字时钟功能，通过按键能调节时分秒、年月日星期。Keil C51开发环境-AT89S51 MCU LCD1602 display with digital clock function, through the buttons can be conditioned every minute, day of week. Keil C51 Development Environment

c8051f06x系列单片机的程序，包括头文件和ad转换等一些常见的，一共有三个-Series Singlechip c8051f06x procedures, including the header files and ad some common conversion, a total of three

读取韦根数据转换成RS232后传给上位机的程序-Wiegand reader into RS232 data to the host computer after the procedure

AD转换器MAX127驱动程序（ KEIL C51 ）-AD converters MAX127 driver (KEIL C51)

数字电压表的汇编源程序,大家多多关照,指点一二.-digital voltage source compilation of the questionnaire, to take care of everyone, pointing out January 2.

简易电子钟的设计 源程序-simple electronic clock design source

一个单片机的按键程序。没有使用延时。但是使用其他的方式来达到了延时的目的。-A single-chip key procedures. Do not use the delay. However, the use of other means to achieve the purpose of delay.

相关富士通单片机实用资料6-Fujitsu MCU related practical information 6