MPC5675K datasheet(14/140 Pages) FREESCALE

14 / 140 page

MPC5675K Microcontroller Data Sheet, Rev. 4

Preliminary—Subject to Change Without Notice

Overview

Freescale Semiconductor

1.4.20

Motor control (MOTC) peripherals

The peripherals in this section can be used for general-purpose applications, but are specifically designed

for motor control (MOTC) applications.

1.4.20.1

FlexPWM

The pulse width modulator module (FlexPWM) contains three PWM channels, each of which is

configured to control a single half-bridge power stage. There may also be one or more fault channels.

This PWM is capable of controlling most motor types: AC induction motors (ACIM), Permanent Magnet

AC motors (PMAC), both brushless (BLDC) and brush DC motors (BDC), switched (SRM) and variable

reluctance motors (VRM), and stepper motors.

A FlexPWM module implements the following features:

•

16 bits of resolution for center, edge aligned, and asymmetrical PWMs

•

Maximum operating frequency lower than or equal to platform frequency

•

Clock source not modulated and independent from system clock (generated via auxiliary PLL)

•

Fine granularity control for enhanced resolution of the PWM period

•

PWM outputs can operate as complementary pairs or independent channels

•

Ability to accept signed numbers for PWM generation

•

Independent control of both edges of each PWM output

•

Synchronization to external hardware or other PWM is supported

•

Double-buffered PWM registers

— Integral reload rates from 1 to 16

— Half-cycle reload capability

•

Multiple ADC trigger events can be generated per PWM cycle via hardware

•

Fault inputs can be assigned to control multiple PWM outputs

•

Programmable filters for fault inputs

•

Independently programmable PWM output polarity

•

Independent top and bottom deadtime insertion

•

Each complementary pair can operate with its own PWM frequency and deadtime values

•

Individual software control for each PWM output

•

All outputs can be forced to a value simultaneously

•

PWMX pin can optionally output a third signal from each channel

•

Channels not used for PWM generation can be used for buffered output compare functions

•

Channels not used for PWM generation can be used for input capture functions

•

Enhanced dual-edge capture functionality

•

Option to supply the source for each complementary PWM signal pair from any of the following:

— External digital pin

— Internal timer channel

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