SPI - Master and Slave: In SPI, every device connected is either a Master or a Slave. Less power consumption as compared to I2C.Various peripherals – like sensors, memory devices, real time clocks, communication protocols like Ethernet, etc.Wireless transmissions through Zigbee, Bluetooth etc. Wired communication (multiple slave or master systems, as addressing is much simpler in SPI).This means that there is no portability issues and you can connect devices of two different architectures together also. Since SPI has been accepted as a de facto standard, it is available in almost all architectures, including 8051, x86, PIC, AVR, MSP, ARM etc., and therefore widely used. With this interface, one Master device which initiates and controls the communication, and one or more slaves who receive and transmit to the Master. The SPI is a very simply Synchronous Peripheral Interfacing(allows devices to send and receive data at the same time) is full duplex communication.
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