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AT32UC3A0512 Datasheet(PDF) 75 Page - ATMEL Corporation |
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AT32UC3A0512 Datasheet(HTML) 75 Page - ATMEL Corporation |
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75 / 98 page  75 AT32UC3A None. 15.2.9 USART 1. ISO7816 info register US_NER cannot be read The NER register always returns zero. Fix/Workaround None 15.2.10 Processor and Architecture 1. LDM instruction with PC in the register list and without ++ increments Rp 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. 2. RETE instruction does not clear SREG[L] from interrupts. 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. 3. Exceptions when system stack is protected by MPU RETS behaves incorrectly when MPU is enabled and MPU is configured so that system stack is not readable in unprivileged mode. Fix/Woraround 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. 32058KS–AVR32–01/12 |
Similar Part No. - AT32UC3A0512_14 |
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Similar Description - AT32UC3A0512_14 |
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