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Serial peripheral interface
Serial Peripheral Interface (SPI) is a communication protocol developed by Motorola for serial communication. It uses a master-slave architecture with 4 connection wires - MOSI, MISO, SCLK, and SS. The master device controls the clock signal and initiates data transfer to and from the slave devices. SPI allows for full duplex communication at high speeds and is commonly used with peripherals like converters, memories, sensors, and displays. While it provides high throughput, SPI requires more pins than alternatives like I2C and does not have hardware flow control or slave acknowledgement.
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Serial peripheral interface
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- 3. Introduction Communication Protocol DevelopedBy Motorola Four Wire Protocol Serial Interface Master-Slave Approach Synchronous- Data clocked with Clock Signal Data Rate-10mbps
- 4. Overview Simple SPI ProtocolSpecifies 4 Signal Wires 1. Master Out Slave In (MOSI) 2. Master In Slave Out (MISO) 3. Serial Clock (SCLK) 4. Slave Select (SS)
- 5. Single Master SingleSlave • • • • Master Initiates the Connection Controls SCLK and Data transfer Slave Transmits Data Receives Data SCLK MOSI Master MISO SS Slave
- 6. Single Master MultipleSlave SCLK MOSI Master MISO SS1 SS2 SCLK MOSI MISO SS SCLK MOSI MISO SS
- 7. How Do TheyCommunicate Communication Initiated by Master only Master Configures the clock – Frequency less than equal to maximum frequency Slave Support Master Selects Slave – By Pulling chip select(SS) of particular Slave-peripheral to Low State
- 8. Advantages Full Duplex Communication HigherThroughput than I2C Not Limited to 8 bit words in case of bit transferring Arbitrary choice of message size, content and Purpose Low Power
- 9. Disadvantages Requires more pinsthan I2C No hardware flow control No Slave Acknowledgement Multi Master Difficult to Implement Short Distance
- 10. SPI Peripherals Converters (ADC,DAC) Memories (EEPROM, RAM’s, Flash) Sensors (Temperature, Humidity, Pressure) Real Time Clocks Misc.- Potentiometers, LCD controllers, UART’s, USB controller, CAN controller, amplifiers