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ATSAM4S-XPLD
723
SAM4S [DATASHEET]
11100E–ATARM–24-Jul-13
Figure 35-42.Local Loopback Mode Configuration
35.7.9.4 Remote Loopback Mode
. The transmitter and the
receiver are disabled and have no effect. This mode allows bit-by-bit retransmission.
Figure 35-43.Remote Loopback Mode Configuration
35.7.10 Write Protection Registers
To prevent any single software error that may corrupt USART behavior, certain address spaces can be write-protected
by setting the WPEN bit in the USART Write Protect Mode Register (US_WPMR).
by setting the WPEN bit in the USART Write Protect Mode Register (US_WPMR).
If a write access to the protected registers is detected, then the WPVS flag in the USART Write Protect Status Register
(US_WPSR) is set and the field WPVSRC indicates in which register the write access has been attempted.
(US_WPSR) is set and the field WPVSRC indicates in which register the write access has been attempted.
The WPVS flag is automatically reset by reading the USART Write Protect Mode Register (US_WPMR) with the
appropriate access key, WPKEY.
appropriate access key, WPKEY.
The protected registers are:
Receiver
Transmitter
RXD
TXD
1
Receiver
Transmitter
RXD
TXD
1