摘要：在全數(shù)字化高頻大功率UPS中，大都采用兩片或多片DSP與單片機(jī)共同完成較為復(fù)雜的控制和監(jiān)控任務(wù)。本文主要就SCI串行通訊接口實(shí)現(xiàn)DSP與單片機(jī)串行通訊展開(kāi)討論，同時(shí)給出了利用SPI實(shí)現(xiàn)串行通訊的設(shè)計(jì)方案，分析比較兩種通訊方式異同，給出了DSP與單片機(jī)串行設(shè)計(jì)的基本方法。 敘詞：UPS，DSP，單片機(jī)，串行通訊 Abstract：In total number high frequency High-power UPS,there are two or more pieces DSP and SCM accomplishing the missions which are complicate controlling and stakeouting。This paper mainly discusses the interfaces between DSP and SCM in SCI serial communication,at the same time this paper presents the design of SPI serial communication and analyses the different between the two modes, contemporary　presenting the basic way of serial communication design. Keyword：UPS，DSP，SCM，Serial Communication