Memory Map and Registers

Address Offset	Register name	Width (in bits)	Access	Reset value	Section/page
0000_0000h	Status register (SPI_SR)	32	R	0000_0000h	SPI_SR
0000_0004h	Control register (SPI_CR)	32	R/W	0000_0000h	SPI_CR
0000_0008h	Receive Data register (SPI_RXDR)	32	R	0000_0000h	SPI_RXDR
0000_000Ch	Transmit Data register (SPI_TXDR)	32	W	0000_0000h	SPI_TXDR

Status register (SPI_SR)

Position	Field	Description
31-1	Reserved	This field is reserved. This read-only field is reserved and always has the value 0.
0	TXE	Transmit register Empty 0   The transmit register is full (being sent) 1   The transmit register is empty

Control register (SPI_CR)

SPI_CR contains the control for selecting the SPI frequency and controlling the chip select.

Position	Field	Description
31-16	Prescaler	SPI frequency selector The specified SPI frequency is f_spi = (f_sys / (2 * prescaler)).
15-1	reserved	This field is reserved. This read-only field is reserved and always has the value 0.
0	CS	Active-high Chip select 0   Chip-select disabled 1   Chip-select enabled

Receive Data register (SPI_RXDR)

Position	Field	Description
31-8	reserved	This field is reserved. This read-only field is reserved and always has the value 0.
7-0	RXD	Receive Data The received data is written to this field. The field is cleared by hardware after being read.

Transmit Data register (SPI_TXDR)

Position	Field	Description
31-8	reserved	This field is reserved.
7-0	TXD	Transmit Data Data written to this field is sent through the serial link. The TXE field of the SPI_SR shall be sample before writing again to this field to prevent data loss.