SLAZ484AD December   2012  – May 2021 MSP430F6749

 

  1. 1Functional Advisories
  2. 2Preprogrammed Software Advisories
  3. 3Debug Only Advisories
  4. 4Fixed by Compiler Advisories
  5. 5Nomenclature, Package Symbolization, and Revision Identification
    1. 5.1 Device Nomenclature
    2. 5.2 Package Markings
      1.      PEU128
      2.      PZ100
    3. 5.3 Memory-Mapped Hardware Revision (TLV Structure)
  6. 6Advisory Descriptions
    1. 6.1  ADC39
    2. 6.2  ADC42
    3. 6.3  ADC69
    4. 6.4  AES1
    5. 6.5  AUXPMM1
    6. 6.6  AUXPMM2
    7. 6.7  BSL7
    8. 6.8  BSL14
    9. 6.9  COMP10
    10. 6.10 CPU21
    11. 6.11 CPU22
    12. 6.12 CPU36
    13. 6.13 CPU37
    14. 6.14 CPU40
    15. 6.15 CPU46
    16. 6.16 CPU47
    17. 6.17 DMA4
    18. 6.18 DMA7
    19. 6.19 DMA9
    20. 6.20 DMA10
    21. 6.21 EEM17
    22. 6.22 EEM19
    23. 6.23 EEM23
    24. 6.24 JTAG26
    25. 6.25 JTAG27
    26. 6.26 LCDB6
    27. 6.27 PMM11
    28. 6.28 PMM12
    29. 6.29 PMM14
    30. 6.30 PMM15
    31. 6.31 PMM18
    32. 6.32 PMM20
    33. 6.33 PMM26
    34. 6.34 PORT15
    35. 6.35 PORT19
    36. 6.36 PORT26
    37. 6.37 RTC8
    38. 6.38 SD3
    39. 6.39 SYS16
    40. 6.40 UCS11
    41. 6.41 USCI36
    42. 6.42 USCI37
    43. 6.43 USCI41
    44. 6.44 USCI42
    45. 6.45 USCI47
    46. 6.46 USCI50
  7. 7Revision History

6.40 UCS11

UCS Module

Category

Functional

Function

Modifying UCSCTL4 clock control register triggers an additional erroneous clock request

Description

Changing the SELM/SELS/SELA bits in the UCSCTL4 register will correctly configure the respective clock to use the intended clock source but might also erroneously set XT1/XT2 fault flag if the crystals are not present at XT1/XT2 or not configured in the application firmware. If the NMI interrupt for the OFIFG is enabled, an unintentional NMI interrupt will be triggered and needs to be handled.

Note: The XT1/XT2 fault flag can be set regardless of which SELM/SELS/SELA bit combinations are being changed.

Workaround

Clear all the fault flags in UCSCTL7 register once after changing any of the SELM/SELS/SELA bits in the UCSCTL4 register.
If OFIFG-NMI is enabled during clock switching, disable OFIFG-NMI interrupt  during changing the SELM/SELS/SELA bits in the UCSCTL4 register to prevent unintended NMI.
Alternatively it can be handled accordingly (clear falsely set fault flags) in the Interrupt Service Routine to ensure proper OFIFG clearing.