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SPRUI07–March 2020
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High-Resolution Pulse Width Modulator (HRPWM)
Chapter 4
SPRUI07–March 2020
High-Resolution Pulse Width Modulator (HRPWM)
This chapter should be used in conjunction with the Enhanced Pulse Width Modulator (ePWM) Module
chapter.
The HRPWM module extends the time resolution capabilities of the conventionally derived digital pulse
width modulator (PWM). HRPWM is typically used when PWM resolution falls below ~ 9-10 bits. This
occurs at PWM frequencies greater than ~200 kHz when using a CPU/system clock of 100 MHz. The key
features of HRPWM are:
• Extended time resolution capability
• Used in both duty cycle and phase-shift control methods
• Finer time granularity control or edge positioning using extensions to the Compare A and Phase
registers
• Implemented using the A signal path of PWM, that is, on the EPWMxA output. EPWMxB output has
conventional PWM capabilities
• Self-check diagnostics software mode to check if the micro edge positioner (MEP) logic is running
optimally
Topic ........................................................................................................................... Page
4.1 Introduction ..................................................................................................... 327
4.2 Operational Description of HRPWM .................................................................... 328
4.3 HRPWM Registers ............................................................................................ 346
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