TMS320F28027 Datasheet, PDF (65/130 Pages) Texas Instruments – Piccolo Microcontrollers

TMS320F28027, TMS320F28026, TMS320F28023, TMS320F28022
TMS320F28021, TMS320F28020, TMS320F280200
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SPRS523F – NOVEMBER 2008 – REVISED DECEMBER 2010
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 (i.e., 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.
Copyright © 2008–2010, Texas Instruments Incorporated
Peripherals
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TMS320F28020 TMS320F280200