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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。
An embedded processor “slow bus technology” is proposed. The state machine is used to describe the bus interface timing, and the bus interface operation with peripheral hardware is implemented by software. Taking the embedded RISC micro-controller chip (PIC16C54) as an example, this paper describes how to realize the access to the DTMF encoder / decoder chip (MT8880).