??????? ? ?? PWM

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??????? ? ??PWM
? ? ????? ?????? ???????
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PWM

• Description
• - PWM(Pulse Width Modulation)
• - ??? ??? ??? ??? ?? ?? ??? High ??? ?? ?? ????
  ??? ??? ??? ??
• - PWM ??(period)
• - PWM ???(frequency)
• - Duty Cycle ?? ???? ?? ??? ?? ??
• - ???? ?? ??? ??? ?? ??? ???? ? ?? ??
• - PWM? ??? ???? ??? ???? ??
• - DC ??? ????? ?? ???? ??? PWM ???? ?? ??

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PWM Waveform
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Generation of PWM Outputs Using the GP Timers

• PWM Operation
• - To generate a PWM output with a GP timer, a
  continuous up- or up-/down- counting mode can be
  selected.
• - To set up the GP timer for the PWM operation,
  do the following
• 1. Set up TxPR according to the desired
  PWM(carrier) period
• 2. Set up TxCON to specify the counting mode
  and clock source, and start the operation
• 3. Load TxCMPR with values corresponding to
  the on-line calculated widths(duty cycles) of PWM
  pulses
• - TxPR (PWM period / GP timer input clock)
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• - Continuous up- Asymmetric Waveform
• Continuous up-/down- Symmetric Waveform

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Compare Unit Block Diagram
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Register Setup for Compare Unit Operation
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PWM Circuits Block Diagram
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Dead-Band?

• Description
• - ?????? H-??? ???? ?? ??? ???? ?? ?? ?? ??
• - PWM ?? ?? ? ??? ?? ??? ?? ?? ??? ????? ???
  ???? ?? ??

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Output Logic Block Diagram
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Asymmetric PWM Waveform Generation
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Symmetric PWM Waveform Generation
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Quadrature Encoder Pulse(QEP)