MC68HC705MC4MP datasheet(95/180 Pages) FREESCALE

95 / 180 page

General Release Specification

Pulse Width Modulator

General Release Specification — MC68HC705MC4

Section 10. Pulse Width Modulator

10.1 Contents

10.2

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .96

10.3

PWM Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .96

10.4

PWM Control Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .99

10.4.1

Control Register A and Control Register B . . . . . . . . . . . . .99

10.4.2

RATE Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .104

10.4.3

UPDATE Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .105

10.5

PWM Data Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .109

10.6

PWM during Resets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .110

10.7

PWM Operation in User Mode . . . . . . . . . . . . . . . . . . . . . . . .111

10.7.1

Interlock Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .111

10.7.2

Operation with the Same PWM Rates. . . . . . . . . . . . . . . .113

10.7.3

Operation with Different PWM Rates . . . . . . . . . . . . . . . .114

10.8

PWM during Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . .115

10.9

Application Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .115

10.9.1

Brushed DC Motor Interface . . . . . . . . . . . . . . . . . . . . . . .115

10.9.2

Brushless DC Motor Interface . . . . . . . . . . . . . . . . . . . . . .117

Freescale Semiconductor, Inc.

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