Atmel ARM-Based Evaluation Kit for SAM4S16C, 32-Bit ARM® Cortex® Microcontroller ATSAM4S-WPIR-RD ATSAM4S-WPIR-RD Data Sheet
Product codes
ATSAM4S-WPIR-RD
751
SAM4S Series [DATASHEET]
Atmel-11100G-ATARM-SAM4S-Datasheet_27-May-14
35.6.6 UART Status Register
Name:
UART_SR
Address:
0x400E0614 (0), 0x400E0814 (1)
Access:
Read-only
• RXRDY: Receiver Ready
0: No character has been received since the last read of the UART_RHR, or the receiver is disabled.
1: At least one complete character has been received, transferred to UART_RHR and not yet read.
1: At least one complete character has been received, transferred to UART_RHR and not yet read.
• TXRDY: Transmitter Ready
0: A character has been written to UART_THR and not yet transferred to the Shift Register, or the transmitter is disabled.
1: There is no character written to UART_THR not yet transferred to the Shift Register.
1: There is no character written to UART_THR not yet transferred to the Shift Register.
• ENDRX: End of Receiver Transfer
0: The end of transfer signal from the receiver Peripheral Data Controller channel is inactive.
1: The end of transfer signal from the receiver Peripheral Data Controller channel is active.
1: The end of transfer signal from the receiver Peripheral Data Controller channel is active.
• ENDTX: End of Transmitter Transfer
0: The end of transfer signal from the transmitter Peripheral Data Controller channel is inactive.
1: The end of transfer signal from the transmitter Peripheral Data Controller channel is active.
1: The end of transfer signal from the transmitter Peripheral Data Controller channel is active.
• OVRE: Overrun Error
0: No overrun error has occurred since the last RSTSTA.
1: At least one overrun error has occurred since the last RSTSTA.
1: At least one overrun error has occurred since the last RSTSTA.
• FRAME: Framing Error
0: No framing error has occurred since the last RSTSTA.
1: At least one framing error has occurred since the last RSTSTA.
1: At least one framing error has occurred since the last RSTSTA.
• PARE: Parity Error
0: No parity error has occurred since the last RSTSTA.
1: At least one parity error has occurred since the last RSTSTA.
1: At least one parity error has occurred since the last RSTSTA.
• TXEMPTY: Transmitter Empty
0: There are characters in UART_THR, or characters being processed by the transmitter, or the transmitter is disabled.
1: There are no characters in UART_THR and there are no characters being processed by the transmitter.
1: There are no characters in UART_THR and there are no characters being processed by the transmitter.
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
–
TXEMPTY
–
7
6
5
4
3
2
1
0
PARE
FRAME
OVRE
ENDTX
ENDRX
–
TXRDY
RXRDY