SPI Registers in AVR

Most controllers in the AVR family support SPI. AVR has 3 register associated with the SPI.

1.       SPSR (SPI Status Register)

2.       SPCR (SPI Control Register)

3.       SPDR (SPI Data Register)

Serial Peripheral Interface Protocol

SPI – Serial Peripheral Interface is a bus interface used in many peripheral devices and nowadays almost all microcontrollers have it. Basically it connects a single masters to multiple slaves. So a single master controller can receive and transmit data to multiple slave microcontrollers.