Datasheet

MC9S12E128 Data Sheet, Rev. 1.07

Freescale Semiconductor 323

Chapter 11

Pulse Width Modulator with Fault Protection (PMF15B6CV2)

11.1 Introduction

The Pulse width Modulator with Fault protection (PMF) module can be conﬁgured for one, two, or three

complementary pairs. For example:

• One complementary pair and four independent PWM outputs

• Two complementary pair and two independent PWM outputs

• Three complementary pair and zero independent PWM outputs

• Zero complementary pair and six independent PWM outputs

All PWM outputs can be generated from the same counter, or each pair can have its own counter for three

independent PWM frequencies. Complementary operation permits programmable dead-time insertion,

distortion correction through current sensing by software, and separate top and bottom output polarity

control. Each counter value is programmable to support a continuously variable PWM frequency. Both

edge- and center-aligned synchronous pulse width-control and full range modulation from 0 percent to 100

percent, are supported. The PMF is capable of controlling most motor types: AC induction motors

(ACIM), both brushless (BLDC) and brush DC motors (BDC), switched (SRM), and variable reluctance

motors (VRM), and stepper motors.

11.1.1 Features

• Three complementary PWM signal pairs, or six independent PWM signals

• Three 15-bit counters

• Features of complementary channel operation

— Deadtime insertion

— Separate top and bottom pulse width correction via current status inputs or software

— Separate top and bottom polarity control

• Edge-aligned or center-aligned PWM signals

• Half-cycle reload capability

• Integral reload rates from 1 to 16

• Individual software-controlled PWM output

• Programmable fault protection

• Polarity control