Atmel ARM-Based Evaluation Kit for SAM4S16C, 32-Bit ARM® Cortex® Microcontroller ATSAM4S-WPIR-RD ATSAM4S-WPIR-RD Data Sheet

SAM4S Series [DATASHEET]

Atmel-11100G-ATARM-SAM4S-Datasheet_27-May-14

816

US_CSR (SPI_MODE)

0x40024014 (0), 0x40028014 (1)

Read-only 

This configuration is relevant only if USART_MODE = 0xE or 0xF in “USART Mode Register” on page 798.

0: No complete character has been received since the last read of US_RHR or the receiver is disabled. If characters were 

being received when the receiver was disabled, RXRDY changes to 1 when the receiver is enabled.
1: At least one complete character has been received and US_RHR has not yet been read. 

0: A character is in the US_THR waiting to be transferred to the Transmit Shift Register or the transmitter is disabled. As 

soon as the transmitter is enabled, TXRDY becomes 1.
1: There is no character in the US_THR.

0: No overrun error has occurred since the last RSTSTA.
1: At least one overrun error has occurred since the last RSTSTA.

0: There are characters in either US_THR or the Transmit Shift Register, or the transmitter is disabled.
1: There are no characters in US_THR, nor in the Transmit Shift Register.

0: No SPI underrun error has occurred since the last RSTSTA.
1: At least one SPI underrun error has occurred since the last RSTSTA.

31

30

29

28

27

26

25

24

–

–

–

–

–

–

–

–

23

22

21

20

19

18

17

16

–

–

–

–

–

–

–

–

15

14

13

12

11

10

9

8

–

–

–

RXBUFF

TXBUFE

UNRE

TXEMPTY

–

7

6

5

4

3

2

1

0

–

–

OVRE

ENDTX

ENDRX

–

TXRDY

RXRDY