![]() Now let’s see in little more detailed level like how it is working in hardware level. Hope you got the basic idea of an SPI bus. So SPI requires more communication lines in contrast to UART, I 2C, USB etc. In the case of single slave communications we need only 3 wires, as slave select (SS) is not required. SPI is called as a 4-wire bus as it requires four wires for its communication as shown below. Multiple slaves are supported through individual slave select lines. ![]() SPI devices communicates each other using a master slave architecture with a single master. ![]() ![]() It is usually used for communication between different modules in a same device or PCB. SPI (Serial Peripheral Interface) is a full duplex synchronous serial communication interface used for short distance communications. 5.1 How a Master read data from a Slave ?. ![]()
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