SLAZ405I October   2012  – May 2021 MSP430G2121

 

  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.      PW14
      2.      N14
      3.      RSA16
    3. 5.3 Memory-Mapped Hardware Revision (TLV Structure)
  6. 6Advisory Descriptions
    1. 6.1  BCL12
    2. 6.2  BCL14
    3. 6.3  CPU4
    4. 6.4  EEM20
    5. 6.5  FLASH16
    6. 6.6  SYS15
    7. 6.7  TA12
    8. 6.8  TA16
    9. 6.9  TA21
    10. 6.10 TAB22
    11. 6.11 USI4
    12. 6.12 USI5
    13. 6.13 XOSC5
    14. 6.14 XOSC8
  7. 7Revision History

6.7 TA12

TA Module

Category

Functional

Function

Interrupt is lost (slow ACLK)

Description

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

Workaround

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