mc68hc908sr12 Freescale Semiconductor, Inc, mc68hc908sr12 Datasheet - Page 211

• Manufacturer Part Number: mc68hc908sr12
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

13.1 Contents
13.2 Introduction
MC68HC908SR12•MC68HC08SR12 — Rev. 5.0
Freescale Semiconductor
Data Sheet — MC68HC908SR12•MC68HC08SR12
13.2
13.3
13.4
13.5
13.6
13.7
13.8
13.9
13.10 I/O Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217
13.10.1 PWM Control Register (PWMCR) . . . . . . . . . . . . . . . . . . . 217
13.10.2 PWM Clock Control Register (PWMCCR) . . . . . . . . . . . . . 218
13.10.3 PWM Data Registers (PWMDR0–PWMDR2) . . . . . . . . . . 219
13.10.4 PWM Phase Control Register . . . . . . . . . . . . . . . . . . . . . . 220
This section describes the pulse width modulator (PWM) module. The
PWM module provides three 8-bit PWM output channels, with an
independent 8-bit counter for each channel. The PWM period is equal to
For a 32MHz PWM counter clock, the PWM period is 8µs (a PWM
frequency of 125kHz). The automatic phase control feature allows
phase delays between the channels.
Figure 13-2
256
Section 13. Pulse Width Modulator (PWM)
×
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Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 212
PWM Period and Resolution. . . . . . . . . . . . . . . . . . . . . . . . . . 214
PWM Automatic Phase Control . . . . . . . . . . . . . . . . . . . . . . .215
Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216
Wait Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216
Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216
I/O Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217
P
CLK
1
Pulse Width Modulator (PWM)
shows the structure of the PWM module.
seconds, where P
CLK
is the PWM counter clock.
Data Sheet
211