SLAZ504AC January   2013  – May 2021 MSP430F67491

 

  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  AUXPMM1
    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 RTC8
    37. 6.37 SD3
    38. 6.38 SYS16
    39. 6.39 UCS11
    40. 6.40 USCI36
    41. 6.41 USCI37
    42. 6.42 USCI41
    43. 6.43 USCI42
    44. 6.44 USCI47
    45. 6.45 USCI50
  7. 7Revision History

USCI37

USCI Module

Category

Functional

Function

Reading RXBUF during an active I2C communication might result in unintended bus stalls.

Description

The falling edge of SCL bus line is used to set an internal RXBUF-written flag register, which is used to detect a potential RXBUF overflow. If this flag is cleared with a read access from the RXBUF register during a falling edge of SCL, the clear condition might be missed. This could result in an I2C bus stall at the next received byte.

Workaround

(1) Execute two consecutive reads of RXBUF, if tSCL > 4 x tMCLK.

or

(2) Provoke an I2C bus stall before reading RXBUF. A bus stall can be verified by checking if the clock line low status indicator bit UCSCLLOW is set for at least three USCI bit clock cycles i.e. 3 x tBitClock.