SLAZ542T July   2013  – May 2021 MSP430F5234

 

  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.      RGZ48
    3. 5.3 Memory-Mapped Hardware Revision (TLV Structure)
  6. 6Advisory Descriptions
    1. 6.1  BSL7
    2. 6.2  COMP10
    3. 6.3  CPU21
    4. 6.4  CPU22
    5. 6.5  CPU40
    6. 6.6  CPU47
    7. 6.7  DMA4
    8. 6.8  DMA7
    9. 6.9  DMA10
    10. 6.10 EEM17
    11. 6.11 EEM19
    12. 6.12 EEM21
    13. 6.13 EEM23
    14. 6.14 JTAG26
    15. 6.15 JTAG27
    16. 6.16 PMAP1
    17. 6.17 PMM9
    18. 6.18 PMM11
    19. 6.19 PMM12
    20. 6.20 PMM14
    21. 6.21 PMM15
    22. 6.22 PMM18
    23. 6.23 PMM20
    24. 6.24 PORT15
    25. 6.25 PORT19
    26. 6.26 PORT33
    27. 6.27 RTC3
    28. 6.28 RTC6
    29. 6.29 SYS12
    30. 6.30 SYS16
    31. 6.31 UCS7
    32. 6.32 UCS9
    33. 6.33 UCS11
    34. 6.34 USCI26
    35. 6.35 USCI34
    36. 6.36 USCI35
    37. 6.37 USCI39
    38. 6.38 USCI40
  7. 7Revision History

6.37 USCI39

USCI Module

Category

Functional

Function

USCI I2C IFGs UCSTTIFG, UCSTPIFG, UCNACKIFG

Description

Unpredictable code execution can occur if one of the hardware-clear-able IFGs UCSTTIFG, UCSTPIFG or UCNACKIFG is set while the global interrupt enable is set by software (GIE=1). This erratum is triggered if ALL of the following events occur in following order:

1. Pending Interrupt: One of the UCxIFG=1 AND UCxIE=1 while GIE=0

2. The GIE is set by software (e.g. EINT)

3. The pending interrupt is cleared by hardware (external I2C event) in a time window of 1 MCLK clock cycle after the "EINT" instruction is executed.

Workaround

Disable the UCSTTIE, UCSTPIE and UCNACKIE before the GIE is set. After GIE is set, the local interrupt enable flags can be set again.

Assembly example:

   bic #UCNACKIE+UCSTPIE+UCSTTIE, UCBxIE ; disable all self-clearing interrupts
   NOP
   EINT
   bis #UCNACKIE+UCSTPIE+UCSTTIE, UCBxIE ; enable all self-clearing interrupts