Atmel Xplained Pro Evaluation Kit ATSAM4E-XPRO ATSAM4E-XPRO Data Sheet

SAM4E [DATASHEET]

Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14

930

1: Start frame delimiter is one bit.

US_MR (SPI_MODE)

0x400A0004 (0), 0x400A4004 (1)

Read/Write 

This configuration is relevant only if USART_MODE = 0xE or 0xF in “USART Mode Register” on page 927.

This register can only be written if the WPEN bit is cleared in “USART Write Protection Mode Register” on page 955.









– Applicable if USART operates in SPI mode (USART_MODE = 0xE or 0xF):

0: Data is changed on the leading edge of SPCK and captured on the following edge of SPCK.

1: Data is captured on the leading edge of SPCK and changed on the following edge of SPCK.

CPHA determines which edge of SPCK causes data to change and which edge causes data to be captured. CPHA is used 
with CPOL to produce the required clock/data relationship between master and slave devices.

31

30

29

28

27

26

25

24

–

–

–

–

–

–

–

–

23

22

21

20

19

18

17

16

–

–

–

WRDBT

–

–

–

CPOL

15

14

13

12

11

10

9

8

–

–

–

–

–

–

–

CPHA

7

6

5

4

3

2

1

0

CHRL

USCLKS

USART_MODE

0xE

SPI_MASTER

SPI master

0xF

SPI_SLAVE

SPI Slave

0

MCK

Peripheral clock is selected

1

DIV

Peripheral clock divided (DIV=8) is selected

3

SCK

Serial Clock SLK is selected

3

8_BIT

Character length is 8 bits