Datasheet

TMS320F28027, TMS320F28026, TMS320F28023, TMS320F28022

TMS320F28021, TMS320F28020, TMS320F280200

SPRS523J –NOVEMBER 2008–REVISED OCTOBER 2013

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4.6 High-Resolution PWM (HRPWM)

This module combines multiple delay lines in a single module and a simplified calibration system by using

a dedicated calibration delay line. For each ePWM module there is one HR delay line.

The HRPWM module offers PWM resolution (time granularity) that is significantly better than what can be

achieved using conventionally derived digital PWM methods. The key points for the HRPWM module are:

• Significantly extends the time resolution capabilities of conventionally derived digital PWM

• This capability can be utilized in both single edge (duty cycle and phase-shift control) as well as dual

edge control for frequency/period modulation.

• Finer time granularity control or edge positioning is controlled via extensions to the Compare A and

Phase registers of the ePWM module.

• HRPWM capabilities, when available on a particular device, are offered only on the A signal path of an

ePWM module (that is, on the EPWMxA output). EPWMxB output has conventional PWM capabilities.

NOTE

The minimum SYSCLKOUT frequency allowed for HRPWM is 50 MHz.

NOTE

When dual-edge high-resolution is enabled (high-resolution period mode), the PWMxB output

is not available for use.

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