ATEVK1104 Atmel, ATEVK1104 Datasheet - Page 80

• Manufacturer Part Number: ATEVK1104
• Description: KIT DEV/EVAL FOR AVR32 AT32UC3A
• Manufacturer: Atmel
• Series: AVR®32r
• Type: MCUr

Specifications of ATEVK1104

• Contents: Evaluation Board, Software and Documentation
• Processor To Be Evaluated: AT32UC3A3
• Data Bus Width: 32 bit
• Interface Type: USB, SPI, USART
• Silicon Manufacturer: Atmel
• Core Architecture: AVR
• Core Sub-architecture: AVR UC3
• Silicon Core Number: AT32UC3A3256
• Silicon Family Name: AVR
• Kit Contents: Board CD Docs
• Rohs Compliant: Yes
• For Use With/related Products: AT32UC3A3
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

13.1.4
13.1.5
13.1.6
32072C–AVR32–2010/03
USART
SPI
PDCA
1. The NER register always returns zero.
1. SPI Disable does not work in Slave mode
2. SPI Bad Serial Clock Generation on 2nd chip_select when SCBR = 1, CPOL=1 and
3. SPI RDR.PCS is not correct
4. SPI data transfer hangs with CSAAT=1 in CSR0 and MODFDIS=0 in MR
5. Disabling SPI has no effect on the TDRE flag
1. PCONTROL.CHxRES is nonfunctional
2. Transfer error will stall a transmit peripheral handshake interface.
Fix/Workaround
None
Fix/workaround
Read the last received data then perform a Software reset.
NCPHA=0
When multiple CS are in use, if one of the baudrate equals to 1 and one of the others doesn't
equal to 1, and CPOL=1 and CPHA=0, then an additional pulse will be generated on SCK.
Fix/workaround
When multiple CS are in use, if one of the baudrate equals 1, the other must also equal 1 if
CPOL=1 and CPHA=0.
The PCS (Peripheral Chip Select) field in the SPI RDR (Receive Data Register) does not
correctly indicate the value on the NPCS pins at the end of a transfer.
Fix/Workaround
Do not use the PCS field of the SPI RDR.
When CSAAT=1 in CSR0 and mode fault detection is enabled (MODFDIS=0 in MR), the
SPI module will not start a data transfer.
Fix/Workaround
Disable mode fault detection by writing a one to MODFDIS in MR.
Disabling SPI has no effect on TDRE whereas the write data command is filtered when SPI
is disabled. This means that as soon as the SPI is disabled it becomes impossible to reset
the TDRE flag by writing in the TDR. So if the SPI is disabled during a PDCA transfer, the
PDCA will continue to write data in the TDR (as TDRE stays high) until its buffer is empty,
and all data written after the disable command is lost.
Fix/Workaround
Disable the PDCA, 2 NOP (minimum), disable SPI. When you want to continue the transfer:
Enable SPI, enable PDCA.
PCONTROL.CHxRES is nonfunctional. Counters are reset at power-on, and cannot be
reset by software.
Fix/Workaround
Software needs to keep history of performance counters.
If a tranfer error is encountered on a channel transmitting to a peripheral, the peripheral
handshake of the active channel will stall and the PDCA will not do any more transfers on
the affected peripheral handshake interface.
AT32UC3A3/A4
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