SLAZ364L October   2012  – May 2021 MSP430FG438

 

  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.      PN80
      2.      ZCA113
    3. 5.3 Memory-Mapped Hardware Revision (TLV Structure)
  6. 6Advisory Descriptions
    1. 6.1  ADC18
    2. 6.2  ADC25
    3. 6.3  CPU4
    4. 6.4  DAC4
    5. 6.5  EEM20
    6. 6.6  FLL3
    7. 6.7  OA1
    8. 6.8  TA12
    9. 6.9  TA16
    10. 6.10 TA21
    11. 6.11 TAB22
    12. 6.12 TB2
    13. 6.13 TB16
    14. 6.14 TB24
    15. 6.15 US14
    16. 6.16 US15
    17. 6.17 WDG2
    18. 6.18 XOSC5
    19. 6.19 XOSC9
  7. 7Revision History

6.12 TB2

TB Module

Category

Functional

Function

Interrupt is lost (slow ACLK)

Description

Timer_B counter is running with slow clock (external TBCLK or ACLK) compared to MCLK. The compare mode is selected for the capture/compare channel and the CCRx register is incremented by 1 with the occurring compare interrupt (if TBR = CCRx).
Due to the fast MCLK, the CCRx register increment (CCRx = CCRx + 1) happens before the Timer_B counter has incremented again. Therefore, the next compare interrupt should happen at once with the next Timer_B counter increment (if TBR = CCRx + 1). This interrupt is lost.

Workaround

Switch capture/compare mode to capture mode before the CCRx register increment. Switch back to compare mode afterward.