本文主要介绍Embedded Modem Si2414 与M30622M4 单片机利用串行接口模式在税控终端产品中的应用；重点介绍运用Embedded Modem Si2414 与M30622M4 单片机在串行接口模式状态下通信的硬件连接及软件设计；文中还给出了初始化SI2414 的过程。关键词 Embedded Modem 单片机电子申报器Abstract: This paper describes the serial communication of Embedded Modem Si2414 andM30622M4 sing-chip computer in tax declared terminal unit. It emphasized the hardward link andsoftware design procedure under serial interface mode. It introduce the process initialize Si2414.Keywords: Embedded Modem sing-chip computer Tax Declared Terminal