Set for Master mode and clear the bit for Slave mode.īit 3 is CPOL, Clock Polarity Select bit. If the bit is clear, then MSB is transmitted first.īit 4 is MSTR, Master/Slave Select bit. If the bit is set, then it transmits LSB first. You need to set this bit high to enable the SPI.īit 5 is DORD, Data Order bit. You can enable SPI Interrupt by setting the bit high and disabling it by setting the bit low.īit 6 is SPE, SPI Enable bit. SPI Master-Slave Interfacingīit 7 is SPIE, SPI Interrupt Enable bit. An SPI can have only one Master and can have multiple slaves.Ī Master is usually a microcontroller, and the slaves can be a microcontroller or any peripherals such as sensors, ADC, DAC, LCD, RTC, etc. SPI communication uses four wires MISO, MOSI, CLK, and CS/SS. It is also known as the four-wire protocol. However, once the communication begins, both Master and Slave can transmit the data simultaneously. SPI device can be set as Master or Slave, and only the Master can generate clock pulses and initiate the communication. SPI is a synchronous serial communication protocol to transfer the data with rising or falling edge of clock pulse between two microcontrollers or between the microcontroller and SPI peripheral devices. This means that data can be transferred in both directions at the same time simultaneously. SPI is a synchronous serial communication and full-duplex protocol. Motorola founded SPI (Serial Peripheral Interface) interface in 1970. is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to products on. Supplies Hardware components Arduino UNO Rev3 Interfacing of RFID-RC522 Module with Arduino Uno.How to use the RFID-RC522 module (RFID reader) with the Arduino UNO.Interfacing of Arduino Uno Board and Arduino Mega Board for SPI. Interfacing of two Arduino Uno Boards for SPI. How do I connect two Arduinos with SPI?.
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