SPI (Serial Peripheral Interface) - definition
SPI (Serial Peripheral Interface) - definition
SPI (Serial Peripheral Interface) is a synchronous communication interface designed to exchange data between a microcontroller and peripherals in electronic systems. The standard was developed by Motorola and is widely used in applications requiring high-speed, full duplex information transfer with a small number of transmission cables.
The SPI interface is based on the principle of serial bus operation with one master and one or more slaves, requiring an individual chip select line for each slave. Communication is via four basic signals: the transfer clock (SCLK), the data sent by the master (MOSI), the data sent by the slave (MISO) and the chip select signal (SS or CS). Transmission synchronisation allows precise control of data flow and elimination of errors due to the absence of a reference clock, which distinguishes SPI from asynchronous interfaces.
SPI has the advantage of simplicity, low latency and high bandwidth, making it suitable for Flash memories, ADC/DACs, displays or sensors. However, the interface does not include mechanisms for addressing or multi-device automated transmission, which limits its use in more complex network topologies. The configuration of the SPI protocol can be customised in terms of operating mode, clock polarity and sampling phase, providing flexibility to suit the requirements of different circuits.
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