High Resolution PWM (HRPWM)
Significantly increases the resolution of conventionally derived digital PWM
Uses 8-bit extensions to Compare registers (CMPxHR) and Phase register
(TBPHSHR) for edge positioning control
Typically used when PWM resolution falls below ~9-10 bits which occurs at
frequencies greater than ~200 kHz (with system clock of 100 MHz)
Not all ePWM outputs support HRPWM feature (see device data manual)
PWM Period
Device Clock
(i.e. 100MHz)
Regular
PWM Step
(i.e. 10ns)
HRPWM
Micro Step (~150ps)
HRPWM divides a clock
cycle into smaller steps
called Micro Steps
(Step Size ~= 150ps)
ms ms ms ms ms ms
Calibration Logic
Calibration Logic tracks the
number of Micro Steps per
clock to account for
variations caused by
Temp/Volt/Process
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