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本文以I/O扩展器EM83010为例,说明总线在单片机I/O扩展中的应用。 EM83010简介 EM83010是EMC公司生产的带串行接口的I/O扩展器,它具有以下功能及特点:通过I~2C总线接口与MCU相连,有14个双向I/O口线,2个I/O寄存器,2个I/O控制寄存器和144×8bit片内RAM;I~2C总线最多可同时接8片EM83010(此时扩展I/O数量为112个,RAM数量为1152×8bit)。
In this paper, I / O extender EM83010 as an example to illustrate the bus in the microcontroller I / O expansion applications. EM83010 Introduction The EM83010 is an I / O extender with serial interface manufactured by EMC Corporation. The EM83010 has the following functions and features: It is connected to the MCU via the I ~ 2C bus interface and has 14 bidirectional I / O lines, two I / O registers, two I / O control registers and 144 × 8bit on-chip RAM. Up to eight EM83010s can be connected to the I ~ 2C bus at this time (112 expansion I / Os and 1152 × 8 bit RAMs).