【摘要】 提出一种嵌入式处理器“慢总线技术”，采用状态机描述总线接口时序，用软件实现与外围硬件的总线接口工操作。并以嵌入式ＲＩＳＣ微控制器芯片（ＰＩＣ１６Ｃ５４）为例，描述了对ＤＴＭＦ编／解码芯片（ＭＴ８８８０）接口访问的实现方法。更多还原

【Abstract】 In the paper, a technology of "Slow-bus" in embedded processor is proposed, which is implemented by software, to solve the problem. By the software state-machine method, the timing of peripheral interface bus can be described as the sequence of states. In our paper, we give an implementation example of interface between RISC microprocessor PIC16C54 and DTMF code/decoder chip MT8880.更多还原