![]() ![]() After 8 clock pulses data in the master device (A7 ~ A0) is transferred to slave device and data in the slave device (B7 ~ B0) is transferred to the master device. Master will generate clock whenever it wants to write data to a Slave device. You can easily understand the working from the above animation. Working of SPI SPI Working – Data Transfer You can see that the clock signal is generated by the master device. Output of a register is connected to the input of another register and vice versa. These registers operate in Serial In/Serial Out (SISO) mode. Hardware SPI Internal Hardware SetupĪs you can see above shift registers in the master and slave devices are connected together such that it forms a circular buffer. Each devices (master and slave) uses shift registers to shift data in and out of the system.įor the sake of explanation here we can considering only a single slave device. Its operation is based on shift registers (usually 8 bit). ![]() SPI having relatively very simple hardware compared to other serial communication protocols like UART, I 2C etc. ![]() 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.
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