ATEVK1104S Atmel, ATEVK1104S Datasheet - Page 85

• Manufacturer Part Number: ATEVK1104S
• Description: KIT EVAL FOR AT32UC
• Manufacturer: Atmel
• Series: AVR®32 UC3r
• Type: MCUr

Specifications of ATEVK1104S

• Contents: Board, Cables
• Tool Type: Development Kit
• Cpu Core: AVR 32
• Data Bus Width: 32 bit
• Processor Series: AT32
• Processor To Be Evaluated: AT32UC3A3256S
• Interface Type: USB, JTAG, SD Card, Nexus, MMC
• Core Architecture: AVR
• Operating Supply Voltage: 5.5 V
• For Use With/related Products: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

13.2.11
13.3
13.3.1
13.3.2
32072C–AVR32–2010/03
Rev. D
MCI
General
Processor and Architecture
1. The busy signal of the responses R1b is not taken in account (excepting for CMD12
1. 3.3V supply monitor is not available on revE.
2. Service access bus (SAB) can not access DMACA registers.
1. LDM instruction with PC in the register list and without ++ increments Rp
2. RETE instruction does not clear SREG[L] from interrupts.
3. Exceptions when system stack is protected by MPU
4. Multiply instructions do not work on RevD.
STOP_TRANSFER).
It is not possible to know the busy status of the card during the response (R1b) for the com-
mands CMD7, CMD28, CMD29, CMD38, CMD42, CMD56.
Fix/Workaround
The card busy line should be polled through the GPIO pin for commands CMD7, CMD28,
CMD29, CMD38, CMD42 and CMD56. The GPIO alternate configuration should be restored
after.
Flash register FGPFRLO[30:29] (FGPFRLO GP29,GP30 and GP31) are reserved and must
not be used.
Fix/workaround
None.
Workaround
None.
For LDM with PC in the register list: the instruction behaves as if the ++ field is always set, ie
the pointer is always updated. This happens even if the ++ field is cleared. Specifically, the
increment of the pointer is done in parallel with the testing of R12.
Fix/Workaround
None.
The RETE instruction clears SREG[L] as expected from exceptions.
Fix/Workaround
When using the STCOND instruction, clear SREG[L] in the stacked value of SR before
returning from interrupts with RETE.
RETS behaves incorrectly when MPU is enabled and MPU is configured so that
system stack is not readable in unprivileged mode.
Fix/Workaround
Workaround 1: Make system stack readable in unprivileged mode,
or
Workaround 2: Return from supervisor mode using rete instead of rets. This requires :
1. Changing the mode bits from 001b to 110b before issuing the instruction.
Updating the mode bits to the desired value must be done using a single mtsr instruction so
it is done atomically. Even if this step is described in general as not safe in the UC technical
reference guide, it is safe in this very specific case.
2. Execute the RETE instruction.
AT32UC3A3/A4
85