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本文介绍一个微机可控直接数字频率合成器(DDFS)的实验样机。重点讨论了微机控制部分,其特点是把DDFS经缓冲驱动器直接挂到微机总线上,以实现频率与相位控制,设计了全部硬件和软件。所完成的样机方案具有很强的实用性和灵活性,它既可由用户输入参数(十进制),也可由系统指定参数,保适于单机或测试系统应用。
This article describes an experimental prototype of a microcomputer controllable direct digital synthesizer (DDFS). Focus on the microcomputer control part, which is characterized by the DDFS buffer driver directly linked to the microcomputer bus to achieve frequency and phase control, designed all the hardware and software. The completed prototype program has strong practicability and flexibility. It can be input by the user either in decimal (decimal) or by system-specific parameters, and is suitable for standalone or test system applications.