SLAZ149I October   2012  – May 2021 MSP430F168

 

  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

6.11 I2C12

I2C Module

Category

Functional

Function

Master/Slave looses data on reception (lost RXRDYIFG).

Description

If the I2C data register I2CDRB (I2CDRW) is read at the same time that data is loaded from the internal I2C shift register into I2CDRB (I2CDRW), then the received data is lost and no corresponding receive ready interrupt (RXRDYIFG) is generated. Following RXRDYIFG interrupts are processed but the missing byte cannot be recovered.

Workaround

Do not read the I2CDRB(I2CDRW) register while data is being loaded into it. This can be ensured by reading this register in a timely manner using any one of the following methods:
1) Handle RXRDYIFG events with all other interrupt sources disabled.
2) Use the DMA for receiving incoming I2C data. The DMA interrupt or ARDYIFG interrupt can be used to initiate further processing of received data.
3) Enable nested interrupts to allow immediate processing of RXRDYIFG interrupts. (Care must be taken to avoid stack overflows).