![]() Figure 5.1 shows that the multiple slave devices share SCK, MOSI, and MISO signals. Other than the clock signal, all handshaking is handled by an explicit slave select (SS) or chip select ( CS) signal.įigures 5.1 and 5.2 illustrate the two common SPI bus connection configurations. The slave devices are able to send data to the master over the Master In Slave Out ( MISO) line. The master writes data to the slave using the Master Out Slave In ( MOSI) line. SPI requires four wires for full-duplex operation and supports only one master but multiple slave devices. The master device has exclusive control of the serial clock (SCK) signal that is used to clock the data to and from a slave device. 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. USB Scopes, Analyzers and Signal Generators. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |