![]() As with the I2C protocol, the SPI bus implements a master-slave communications scheme where the master device alone controls the data exchange with slave devices. SPI is a full-duplex synchronous serial communications bus protocol developed by Motorola and has become a de facto standard that has not been adopted by any national or international standards organizations. Unlike I 2C, SPI has no device acknowledge capability. Although I 2C requires only two wires (thus conserving processor pins), rather than four wires required by SPI, I 2C has bandwidth overhead due to the time required for device selection by sending the ID as a serial byte. The SPI serial protocol is capable of higher data rates than I2C because it can generally operate at higher clock rates, and is not limited to 8-bits per word.
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