mc68hc908mr8 Freescale Semiconductor, Inc, mc68hc908mr8 Datasheet - Page 140

• Manufacturer Part Number: mc68hc908mr8
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Pulse-Width Modulator for Motor Control
9.2 Introduction
Technical Data
140
9.12.5
9.12.6
9.12.7
9.12.8
9.12.9
9.12.10 Fault Acknowledge Register . . . . . . . . . . . . . . . . . . . . . .182
9.12.11 PWM Output Control Register. . . . . . . . . . . . . . . . . . . . .184
9.13
This section describes the pulse-width modulator for motor control
(PWMMC, version A). The MC68HC908MR8 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
A 12-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
250 ns (f
When generating complementary PWM signals, the module features
automatic dead-time insertion to the PWM output pairs.
A summary of the PWM registers is shown in
OP
Pulse-Width Modulator for Motor Control (PWMMC)
= 8 MHz). The highest resolution for center-aligned operation is
PWM Glossary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .185
OP
Dead-Time Write-Once Register . . . . . . . . . . . . . . . . . . .179
PWM Disable Mapping Write-Once Register . . . . . . . . .179
Fault Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . .180
PWM Control Register 2 . . . . . . . . . . . . . . . . . . . . . . . . .177
Fault Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . .181
= 8 MHz).
OP
) and a programmable prescaler.
Figure
Figure
MC68HC908MR8 — Rev 4.1
Freescale Semiconductor
9-2.
9-1.