就是51单片机的编译环境，自己看着办下载吧

亲测 可以安装

keil4软件，内含安装教程，安装不用愁！！！Keil C51是美国Keil Software公司出品的51系列兼容单片机C语言软件开发系统

在XC164平台上开发的ADE7878芯片驱动程序，用于演示ADE7878的初始化、码值转换，实现基本电力参数的采集（不包含谐波、零线电流采集等功能），仅用于学习。源码中不包含主程序、滤波和校准。ADE7878的校准可参考ADI公司的AN1076文档。编译环境为KEIL4 for C166。祝大家学习愉快！

可以激活keil4 压缩包中有使用方法

机器型号是STC89C52，使用软件为keil4。 通过动态扫面使8个数码管显示相应数字。

文档里面有安装的详细视频。keil4可以用c和c++语言。编写好后可以与其他软件互联

用51单片机的端口，输出电平控制继电器的吸合和断开，实现对外部装置的控制。程序为c语言，软件keil4

keil中所有库函数的帮助文件。 The C51 run-time library provides you with more than 100 predefined functions and macros to use in your 8051 C programs. This library makes embedded software development easier by providing you with routines that perform common programming tasks such as string and buffer manipulation, data conversion, and floating-point math operations. Typically, the routines in this library conform to the ANSI C Standard. However, some functions differ slightly in order to take advantage of the features found in the 8051 architecture. For example, the function isdigit returns a bit value as opposed to an int. Where possible, function return types and argument types are adjusted to use the smallest possible data type. In addition, unsigned data types are favored over signed types. These alterations to the standard library provide a maximum of performance while also reducing program size. All routines in this library are implemented to be independent of and to function using any register bank.

带有全部STC单片机头文件的keil４，含破解器。STC51单片机玩家首选工具，欢迎下载