PowerFull Apb Timer Controller

Simple 32-bit timer realization with APB interface with support of interrupt generation and switching clock source.

使用Verilog编写的24位定时器，具有apb 总线接口，可以设置工作方式和计数初值。(The 24-bit timer written by Verilog has APB bus interface, which can set working mode and count initial value.)

是基于apb总线下的timer外设的rtl代码，主要包括apb_timer的master逻辑verilog，以及相应的开发文档，包括寄存器的描述，功能特性等。(RTL code is based on timer peripheral under APB bus, which mainly includes master logic Verilog of apb_timer and corresponding development documents, including the descr