To configure the AVR to run in slave mode, there is no order in which the registers
must be initialized. The MISO pin has to be defined as an output pin, while all other
pins are configured automatically as input pins if the SPI is enabled. To configure the
AVR to run in slave mode the MSTR bit has to be set to zero. In this case, the Clock
Rate Select bits SPR0 and SPR1 do not care because of the synchronous transmission.
All other settings of the SPI configuration register (SPCR) have to be the
same as in master mode. This is essential for a successful communication between the two
devices.Figure 3-2. Polled Slave - Initialization
and Reception
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