SLAZ308AD October   2012  – May 2021 MSP430F5522

 

  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.      ZQE80
      2.      RGC64
    3. 5.3 Memory-Mapped Hardware Revision (TLV Structure)
  6. 6Advisory Descriptions
    1. 6.1  ADC25
    2. 6.2  ADC27
    3. 6.3  ADC29
    4. 6.4  ADC42
    5. 6.5  ADC69
    6. 6.6  BSL6
    7. 6.7  BSL7
    8. 6.8  COMP10
    9. 6.9  CPU21
    10. 6.10 CPU22
    11. 6.11 CPU23
    12. 6.12 CPU26
    13. 6.13 CPU27
    14. 6.14 CPU28
    15. 6.15 CPU29
    16. 6.16 CPU30
    17. 6.17 CPU31
    18. 6.18 CPU32
    19. 6.19 CPU33
    20. 6.20 CPU34
    21. 6.21 CPU35
    22. 6.22 CPU37
    23. 6.23 CPU39
    24. 6.24 CPU40
    25. 6.25 CPU47
    26. 6.26 DMA4
    27. 6.27 DMA7
    28. 6.28 DMA8
    29. 6.29 DMA10
    30. 6.30 EEM9
    31. 6.31 EEM11
    32. 6.32 EEM13
    33. 6.33 EEM14
    34. 6.34 EEM15
    35. 6.35 EEM16
    36. 6.36 EEM17
    37. 6.37 EEM19
    38. 6.38 EEM21
    39. 6.39 EEM23
    40. 6.40 FLASH33
    41. 6.41 FLASH34
    42. 6.42 FLASH35
    43. 6.43 FLASH37
    44. 6.44 JTAG20
    45. 6.45 JTAG26
    46. 6.46 JTAG27
    47. 6.47 MPY1
    48. 6.48 PMAP1
    49. 6.49 PMM9
    50. 6.50 PMM10
    51. 6.51 PMM11
    52. 6.52 PMM12
    53. 6.53 PMM14
    54. 6.54 PMM15
    55. 6.55 PMM17
    56. 6.56 PMM18
    57. 6.57 PMM20
    58. 6.58 PORT15
    59. 6.59 PORT16
    60. 6.60 PORT19
    61. 6.61 PORT24
    62. 6.62 RTC3
    63. 6.63 RTC6
    64. 6.64 SYS10
    65. 6.65 SYS12
    66. 6.66 SYS14
    67. 6.67 SYS16
    68. 6.68 SYS18
    69. 6.69 TAB23
    70. 6.70 USB4
    71. 6.71 USB6
    72. 6.72 USB8
    73. 6.73 USB9
    74. 6.74 USB10
    75. 6.75 USB11
    76. 6.76 USB12
    77. 6.77 USB13
    78. 6.78 USCI26
    79. 6.79 USCI30
    80. 6.80 USCI31
    81. 6.81 USCI34
    82. 6.82 USCI35
    83. 6.83 USCI39
    84. 6.84 USCI40
    85. 6.85 WDG4
  7. 7Revision History

6.76 USB12

USB Module

Category

Functional

Function

The 2nd byte of a slave-to-host transmission is sent twice.

Description

In extremely rare cases, when the USB module's PLL is disabled (by clearing the UPLLEN bit), the USB module can be placed into an undetermined state, resulting in an extra byte being sent to the host over the bus. The PLL is usually disabled by software when the USB module detects that the USB device has been suspended by the host. Suspend events can occur at any time, but are typically invoked during periods of inactivity.

Workaround

Once this error occurs, the USB module needs to be reset (by clearing the USBEN bit), and then the module can be re-initialized.  For example, software can call the MSP430 USB API USB_disable() followed by USB_enable(). These actions are taken by the USB APIs when the user unplugs and replugs the USB cable, which is likely to happen when the user realizes the bus is no longer working.  

If automatic detection of the error is required, then software on the host and device could implement a CRC check on the data payload (above the USB API) to detect the extra byte.  If detected, software could then disable/re-enable the USB module.  (The CRC inherent in the USB protocol calculates over the data packet, and thus cannot detect the erroneously added byte.)