SLAZ187T October   2012  – May 2021 MSP430F2617

 

  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.      ZQW113
      2.      PM64
      3.      PN80
      4.      ZCA113
    3. 5.3 Memory-Mapped Hardware Revision (TLV Structure)
  6. 6Advisory Descriptions
    1. 6.1  ADC25
    2. 6.2  BCL12
    3. 6.3  BCL13
    4. 6.4  BCL15
    5. 6.5  CPU8
    6. 6.6  CPU16
    7. 6.7  CPU19
    8. 6.8  DAC4
    9. 6.9  DMA3
    10. 6.10 DMA4
    11. 6.11 DMA13
    12. 6.12 FLASH19
    13. 6.13 FLASH24
    14. 6.14 FLASH25
    15. 6.15 FLASH27
    16. 6.16 FLASH36
    17. 6.17 JTAG23
    18. 6.18 PORT10
    19. 6.19 PORT12
    20. 6.20 TA12
    21. 6.21 TA16
    22. 6.22 TA21
    23. 6.23 TAB22
    24. 6.24 TB2
    25. 6.25 TB16
    26. 6.26 TB24
    27. 6.27 USCI20
    28. 6.28 USCI21
    29. 6.29 USCI22
    30. 6.30 USCI23
    31. 6.31 USCI24
    32. 6.32 USCI25
    33. 6.33 USCI26
    34. 6.34 USCI27
    35. 6.35 USCI30
    36. 6.36 USCI34
    37. 6.37 USCI35
    38. 6.38 USCI40
    39. 6.39 XOSC5
    40. 6.40 XOSC8
  7. 7Revision History

6.27 USCI20

USCI Module

Category

Functional

Function

I2C Mode Multi-master transmitter issue

Description

When configured for I2C master-transmitter mode, and used in a multi-master environment, the USCI module can cause unpredictable bus behavior if all of the following four conditions are true:

1 - Two masters are generating SCL
And
2 - The slave is stretching the SCL low phase of an ACK period while outputting NACK on SDA
And
3 - The slave drives ACK on SDA after the USCI has already released SCL, and then the SCL bus line gets released
And
4 - The transmit buffer has not been loaded before the other master continues communication by driving SCL low

The USCI will remain in the SCL high phase until the transmit buffer is written. After the transmit buffer has been written, the USCI will interfere with the current bus activity and may cause unpredictable bus behavior.

Workaround

1 - Ensure that slave doesn't stretch the SCL low phase of an ACK period
Or
2 - Ensure that the transmit buffer is loaded in time
Or
3 - Do not use the multi-master transmitter mode