ATSAM3U-EK Atmel, ATSAM3U-EK Datasheet - Page 593
ATSAM3U-EK
Manufacturer Part Number
ATSAM3U-EK
Description
KIT EVAL FOR AT91SAM3U CORTEX
Manufacturer
Atmel
Type
MCUr
Datasheets
1.ATSAM3U-EK.pdf
(2 pages)
2.ATSAM3U-EK.pdf
(61 pages)
3.ATSAM3U-EK.pdf
(1171 pages)
4.ATSAM3U-EK.pdf
(53 pages)
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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATSAM3U-EK
Manufacturer:
Atmel
Quantity:
10
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6430D–ATARM–25-Mar-11
6430D–ATARM–25-Mar-11
The transfer of a data written in SPI_TDR in the Shift Register is indicated by the TDRE bit
(Transmit Data Register Empty) in the Status Register (SPI_SR). When new data is written in
SPI_TDR, this bit is cleared. The TDRE bit is used to trigger the Transmit DMA channel.
The end of transfer is indicated by the TXEMPTY flag in the SPI_SR register. If a transfer delay
(DLYBCT) is greater than 0 for the last transfer, TXEMPTY is set after the completion of said
delay. The master clock (MCK) can be switched off at this time.
The transfer of received data from the Shift Register in SPI_RDR is indicated by the RDRF bit
(Receive Data Register Full) in the Status Register (SPI_SR). When the received data is read,
the RDRF bit is cleared.
If the SPI_RDR (Receive Data Register) has not been read before new data is received, the
Overrun Error bit (OVRES) in SPI_SR is set. As long as this flag is set, data is loaded in
SPI_RDR. The user has to read the status register to clear the OVRES bit.
Figure
page 595
32-5, shows a block diagram of the SPI when operating in Master Mode.
shows a flow chart describing how transfers are handled.
SAM3U Series
SAM3U Series
Figure 32-6 on
593
593
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