SLAZ581V January   2014  – May 2021 MSP430F6766A

 

  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  AUXPMM2
    6. 6.6  BSL7
    7. 6.7  BSL14
    8. 6.8  COMP10
    9. 6.9  CPU21
    10. 6.10 CPU22
    11. 6.11 CPU36
    12. 6.12 CPU37
    13. 6.13 CPU40
    14. 6.14 CPU46
    15. 6.15 CPU47
    16. 6.16 DMA4
    17. 6.17 DMA7
    18. 6.18 DMA9
    19. 6.19 DMA10
    20. 6.20 EEM17
    21. 6.21 EEM19
    22. 6.22 EEM23
    23. 6.23 JTAG26
    24. 6.24 JTAG27
    25. 6.25 LCDB6
    26. 6.26 PMM11
    27. 6.27 PMM12
    28. 6.28 PMM14
    29. 6.29 PMM15
    30. 6.30 PMM18
    31. 6.31 PMM20
    32. 6.32 PMM26
    33. 6.33 PORT15
    34. 6.34 PORT19
    35. 6.35 PORT26
    36. 6.36 SD3
    37. 6.37 SYS16
    38. 6.38 UCS11
    39. 6.39 USCI36
    40. 6.40 USCI37
    41. 6.41 USCI41
    42. 6.42 USCI42
    43. 6.43 USCI47
    44. 6.44 USCI50
  7. 7Revision History

6.14 CPU46

CPU Module

Category

Functional

Function

POPM peforms unexpected memory access and can cause VMAIFG to be set

Description

When the POPM assembly instruction is executed, the last Stack Pointer increment is followed by an unintended read access to the memory. If this read access is performed on vacant memory, the VMAIFG will be set and can trigger the corresponding interrupt (SFRIE1.VMAIE) if it is enabled. This issue occurs if the POPM assembly instruction is performed up to the top of the STACK.

Workaround

If the user is utilizing C, they will not be impacted by this issue. All TI/IAR/GCC pre-built libraries are not impacted by this bug. To ensure that POPM is never executed up to the memory border of the STACK when using assembly it is recommended to either

1. Initialize the SP to
a. TOP of STACK - 4 bytes if POPM.A is used
b. TOP of STACK - 2 bytes if POPM.W is used

OR

2. Use the POPM instruction for all but the last restore operation. For the the last restore operation use the POP assembly instruction instead.

For instance, instead of using:


POPM.W #5,R13



Use:


POPM.W #4,R12
POP.W R13



Refer to the table below for compiler-specific fix implementation information.

IDE/Compiler Version Number Notes
IAR Embedded Workbench Not affected C code is not impacted by this bug. User using POPM instruction in assembler is required to implement the above workaround manually.
TI MSP430 Compiler Tools (Code Composer Studio) Not affected C code is not impacted by this bug. User using POPM instruction in assembler is required to implement the above workaround manually.
MSP430 GNU Compiler (MSP430-GCC) Not affected C code is not impacted by this bug. User using POPM instruction in assembler is required to implement the above workaround manually.