ATSAM3U-EK Atmel, ATSAM3U-EK Datasheet - Page 725

• Manufacturer Part Number: ATSAM3U-EK
• Description: KIT EVAL FOR AT91SAM3U CORTEX
• Manufacturer: Atmel
• Type: MCUr

Specifications of ATSAM3U-EK

• Contents: Board
• Processor To Be Evaluated: SAM3U
• Data Bus Width: 32 bit
• Interface Type: RS-232, USB
• Operating Supply Voltage: 3 V
• Silicon Manufacturer: Atmel
• Core Architecture: ARM
• Core Sub-architecture: Cortex - M3
• Silicon Core Number: SAM3U4E
• Silicon Family Name: SAM3U
• Kit Contents: Board CD Docs
• Rohs Compliant: Yes
• For Use With/related Products: AT91SAM3U
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

35.7.8.7
35.7.9
35.7.9.1
Figure 35-39. Normal Mode Configuration
35.7.9.2
Figure 35-40. Automatic Echo Mode Configuration
6430D–ATARM–25-Mar-11
6430D–ATARM–25-Mar-11
WRITE BUFFER
DATA 0
DATA N
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Test Modes
Normal Mode
Automatic Echo Mode
Receiver Timeout
(Peripheral) DMA
Controller
reception but only a low level. However, this low level must be present on the slave select line
(NSS) at least 1 Tbit before the first serial clock cycle corresponding to the MSB bit.
Because the receiver baudrate clock is active only during data transfers in SPI Mode, a receiver
timeout is impossible in this mode, whatever the Time-out value is (field TO) in the Time-out
Register (US_RTOR).
The USART can be programmed to operate in three different test modes. The internal loopback
capability allows on-board diagnostics. In the loopback mode the USART interface pins are dis-
connected or not and reconfigured for loopback internally or externally.
Normal mode connects the RXD pin on the receiver input and the transmitter output on the TXD
pin.
Automatic echo mode allows bit-by-bit retransmission. When a bit is received on the RXD pin, it
is sent to the TXD pin, as shown in
the TXD pin. The RXD pin is still connected to the receiver input, thus the receiver remains
active.
APB bus
TXRDY
Transmitter
Transmitter
Receiver
Receiver
LIN CONTROLLER
USART3
Figure
READ BUFFER
DATA N
DATA 0
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|
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35-40. Programming the transmitter has no effect on
RXD
TXD
RXD
TXD
(Peripheral) DMA
Controller
SAM3U Series
SAM3U Series
APB bus
RXRDY
NACT = SUBSCRIBE
LIN CONTROLLER
USART3
725
725