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AT32UC3A0512 Datasheet(PDF) 88 Page - ATMEL Corporation |
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AT32UC3A0512 Datasheet(HTML) 88 Page - ATMEL Corporation |
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88 / 98 page  88 AT32UC3A 12. CPU cannot operate on a divided slow clock (internal RC oscillator) Fix/Workaround Do not run the CPU on a divided slow clock. 13. 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. 14. 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. 15. 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. 15.5.6 SDRAMC 1. Code execution from external SDRAM does not work Code execution from SDRAM does not work. Fix/Workaround Do not run code from SDRAM. 2. SDRAM SDCKE rise at the same time as SDCK while exiting self-refresh mode SDCKE rise at the same time as SDCK while exiting self-refresh mode. Fix/Workaround None. 15.5.7 USART 1. USART Manchester Encoder Not Working Manchester encoding/decoding is not working. Fix/Workaround Do not use manchester encoding. 32058KS–AVR32–01/12 |
Similar Part No. - AT32UC3A0512_14 |
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