SLAZ348AF October   2012  – May 2021 MSP430F6735

 

  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.      PZ100
      2.      PN80
    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  CPU21
    9. 6.9  CPU22
    10. 6.10 CPU36
    11. 6.11 CPU40
    12. 6.12 CPU46
    13. 6.13 CPU47
    14. 6.14 DMA4
    15. 6.15 DMA7
    16. 6.16 DMA9
    17. 6.17 DMA10
    18. 6.18 EEM8
    19. 6.19 EEM17
    20. 6.20 EEM19
    21. 6.21 EEM23
    22. 6.22 JTAG26
    23. 6.23 JTAG27
    24. 6.24 LCDB5
    25. 6.25 LCDB6
    26. 6.26 PMM7
    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 SD3
    37. 6.37 UCS11
    38. 6.38 USCI36
    39. 6.39 USCI37
    40. 6.40 USCI41
    41. 6.41 USCI42
    42. 6.42 USCI47
    43. 6.43 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.