SPDCR

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Interpret as SPDCR

SPLW=0, SPRDTD=0, SPBYT=0

SPI Data Control Register

SPRDTD	SPI Receive/Transmit Data Select 0 (0): Read SPDR/SPDR_HA values from receive buffer 1 (1): Read SPDR/SPDR_HA values from transmit buffer, but only if the transmit buffer is empty
SPLW	SPI Word Access/Halfword Access Specification 0 (0): Set SPDR_HA to valid for halfword access 1 (1): Set SPDR to valid for word access
SPBYT	SPI Byte Access Specification 0 (0): SPDR/SPDR_HA is accessed in halfword or word (SPLW is valid) 1 (1): SPDR_BY is accessed in byte (SPLW is invalid)

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