SLAZ142I October   2012  – May 2021 MSP430F155

 

  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.      RTD64
      2.      PM64
    3. 5.3 Memory-Mapped Hardware Revision (TLV Structure)
  6. 6Advisory Descriptions
    1. 6.1  ADC18
    2. 6.2  ADC25
    3. 6.3  BCL5
    4. 6.4  CPU4
    5. 6.5  DAC4
    6. 6.6  I2C7
    7. 6.7  I2C8
    8. 6.8  I2C9
    9. 6.9  I2C10
    10. 6.10 I2C11
    11. 6.11 I2C12
    12. 6.12 I2C13
    13. 6.13 I2C14
    14. 6.14 I2C15
    15. 6.15 I2C16
    16. 6.16 TA12
    17. 6.17 TA16
    18. 6.18 TA21
    19. 6.19 TAB22
    20. 6.20 TB2
    21. 6.21 TB16
    22. 6.22 TB24
    23. 6.23 US14
    24. 6.24 US15
    25. 6.25 WDG2
    26. 6.26 XOSC4
  7. 7Revision History

6.8 I2C9

I2C Module

Category

Functional

Function

Master Transmitter Repeat Mode I2CSTP setting error.

Description

When the USART is configured for I2C mode (U0CTL.I2C, SYNC, and I2CEN are set) and the module is configured as an I2C master (U0CTL.MST=1) and repeat mode operation is selected (I2CTCTL.I2CRM=1), the timing of the I2CSTP bit can result in lost data or extra requested transmitted bytes.  
Specifically, if interrupts are active during the following two cases:
1) During the time between the setting of the I2CSTP bit and loading of I2CDRB (I2CDRW).
2) For transmitting slave address only, during the time between checking for I2CSTT cleared and setting I2CSTP.
Note: In the second case, the SCL line will be held low until the I2CDRB (I2CDRW) is loaded and then shifted out.

Workaround

Solution for case #1: disable all interrupts (DINT) before setting I2CSTP then re-enabling after loading of I2CDRB.
Solution for case #2: disable all interrupts (DINT) before setting I2CSTT bit then re-enabling after setting I2CSTP bit.