SDAA032 July   2025 TDA4VE-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Understanding PWM Operation on TDA4x
    1. 2.1 PWM Architecture Overview
    2. 2.2 Counter-Compare Register and Duty Cycle Control
    3. 2.3 Action Qualifier and Output Behavior
    4. 2.4 Synchronization and Update Timing
  6. 3Unintended PWM Duty Cycle from Immediate CMPA Update
  7. 4Unintended PWM Duty Cycle from Up-Down Count Mode
  8. 5Best Practice for Seamless PWM Updates for LED Dimming Control
    1. 5.1 Use Shadow Registers for Duty Cycle Updates
    2. 5.2 Select the Appropriate Counter Mode
    3. 5.3 Register Configurations for Up-count Mode Under Shadowing
  9. 6Summary
  10. 7References

2.3 Action Qualifier and Output Behavior

The Action Qualifier (AQ) module controls how the PWM output responds to events such as TBCNT = CMPA. Developers configure AQCTLA to define actions like set, clear, or toggle based on compare matches or counter zero events. This flexible mechanism enables precise waveform shaping.