ATSAM3S-EK Atmel, ATSAM3S-EK Datasheet - Page 715

• Manufacturer Part Number: ATSAM3S-EK
• Description: KIT EVAL FOR ATSAM3S4C
• Manufacturer: Atmel
• Series: SAM3Sr
• Type: MCUr

Specifications of ATSAM3S-EK

• Contents: Board, Cables, Power Supply
• Silicon Manufacturer: Atmel
• Core Architecture: ARM
• Core Sub-architecture: Cortex-M3
• Kit Contents: Board
• Features: TFT Colour LCD Display, SD/MMC Interface
• Svhc: No SVHC (15-Dec-2010)
• Rohs Compliant: Yes
• For Use With/related Products: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

33.7.8.10
33.7.8.11
33.7.9
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).
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.
The WPVS flag is reset by writing the USART Write Protect Mode Register (US_WPMR) with the appropriate access key,
WPKEY.
The protected registers are:
6500C–ATARM–8-Feb-11
6500C–ATARM–8-Feb-11
•
•
•
•
•
•
•
“USART Mode Register”
“USART Baud Rate Generator Register”
“USART Receiver Time-out Register”
“USART Transmitter Timeguard Register”
“USART FI DI RATIO Register”
“USART IrDA FILTER Register”
“USART Manchester Configuration Register”
Write Protection Registers
Local Loopback Mode
Remote Loopback Mode
Local loopback mode connects the output of the transmitter directly to the input of the receiver,
as shown in
the receiver and the TXD pin is continuously driven high, as in idle state.
Figure 33-43. Local Loopback Mode Configuration
Remote loopback mode directly connects the RXD pin to the TXD pin, as shown in
The transmitter and the receiver are disabled and have no effect. This mode allows bit-by-bit
retransmission.
Figure 33-44. Remote Loopback Mode Configuration
Figure
33-43. The TXD and RXD pins are not used. The RXD pin has no effect on
Transmitter
Transmitter
Receiver
Receiver
1
1
SAM3S Preliminary
SAM3S Preliminary
RXD
TXD
RXD
TXD
Figure
33-44.
715
715