mc68hc708mp16 Freescale Semiconductor, Inc, mc68hc708mp16 Datasheet - Page 130

• Manufacturer Part Number: mc68hc708mp16
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Pulse Width Modulator for Motor Control (PWMMC)
9.2 Introduction
Technical Data
130
9.11
9.11.1
9.11.2
9.11.3
9.11.4
9.11.5
9.11.6
9.11.7
9.11.8
9.11.9
9.11.10
9.11.11
9.12
This section describes the pulse width modulator for motor control
(PWMMC, Version A). The MC68HC(7)08MP16 PWM module can
generate three complementary PWM pairs or six independent PWM
signals. These PWM signals can be center-aligned or edge-aligned. A
block diagram of the PWM module is shown in
A12-bit timer PWM counter is common to all six channels. PWM
resolution is one clock period for edge-aligned operation and two clock
periods for center-aligned operation. The clock period is dependent on
the internal operating frequency (f
The highest resolution for edge-aligned operation is 125 ns (f
MHz). The highest resolution for center-aligned operation is 250 ns
(f
When generating complementary PWM signals, the module features
automatic dead-time insertion to the PWM output pairs and transparent
toggling of PWM data based upon sensed motor phase current polarity.
A summary of the PWM registers is shown in
op
Pulse Width Modulator for Motor Control (PWMMC)
= 8 MHz).
Control Logic Block. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172
PWM Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188
PWM Counter Registers . . . . . . . . . . . . . . . . . . . . . . . . . . 172
PWM Counter Modulo Registers. . . . . . . . . . . . . . . . . . . .173
PWM X Value Registers . . . . . . . . . . . . . . . . . . . . . . . . . . 174
PWM Control Register 1 . . . . . . . . . . . . . . . . . . . . . . . . . . 175
PWM Control Register 2 . . . . . . . . . . . . . . . . . . . . . . . . . . 177
Dead-Time Write-Once Register . . . . . . . . . . . . . . . . . . . .179
PWM Disable Mapping Write-Once Register . . . . . . . . . . 180
Fault Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180
Fault Status Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183
Fault Acknowledge Register . . . . . . . . . . . . . . . . . . . . . . .185
PWM Output Control Register. . . . . . . . . . . . . . . . . . . . . . 186
op
) and a programmable prescaler.
Figure
MC68HC708MP16
Figure
Freescale Semiconductor
9-2.
9-1.
op
—
= 8
Rev. 3.1