Техническая Спецификация для Atmel Evaluation Kit AT91SAM9X25-EK AT91SAM9X25-EK

676

SAM9X25 [DATASHEET]

11054E–ATARM–10-Mar-2014

Name: SPI_MR

0xF0000004 (0), 0xF0004004 (1)

Read-write 

This register can only be written if the WPEN bit is cleared in 

0 = SPI is in Slave mode. 

1 = SPI is in Master mode.

0 = Fixed Peripheral Select.

1 = Variable Peripheral Select.

0 = The chip selects are directly connected to a peripheral device.

1 = The four chip select lines are connected to a 4- to 16-bit decoder.

When PCSDEC equals one, up to 15 Chip Select signals can be generated with the four lines using an external 4- to 16-bit 
decoder. The Chip Select Registers define the characteristics of the 15 chip selects according to the following rules:

SPI_CSR0 defines peripheral chip select signals 0 to 3.

SPI_CSR1 defines peripheral chip select signals 4 to 7.

SPI_CSR2 defines peripheral chip select signals 8 to 11.

SPI_CSR3 defines peripheral chip select signals 12 to 14.

0 = Mode fault detection is enabled. 

1 = Mode fault detection is disabled.

0 = No Effect. In master mode, a transfer can be initiated whatever the state of the Receive Data Register is.

1 = In Master Mode, a transfer can start only if the Receive Data Register is empty, i.e. does not contain any unread data. This 
mode prevents overrun error in reception.

0 = Local loopback path disabled.

1 = Local loopback path enabled.

31

30

29

28

27

26

25

24

DLYBCS

23

22

21

20

19

18

17

16

–

–

–

–

PCS

15

14

13

12

11

10

9

8

–

–

–

–

–

–

–

–

7

6

5

4

3

2

1

0

LLB

–

WDRBT

MODFDIS

–

PCSDEC

PS

MSTR