mc68hc908mr8 Freescale Semiconductor, Inc, mc68hc908mr8 Datasheet - Page 139
mc68hc908mr8
Manufacturer Part Number
mc68hc908mr8
Description
M68hc08 Microcontrollers Microcontroller
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC68HC908MR8.pdf
(372 pages)
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Technical Data — MC68HC908MR8
9.1 Contents
MC68HC908MR8 — Rev 4.1
Freescale Semiconductor
Section 9. Pulse-Width Modulator for Motor Control
9.2
9.3
9.4
9.4.1
9.4.2
9.5
9.5.1
9.5.2
9.6
9.6.1
9.6.2
9.6.3
9.6.4
9.7
9.7.1
9.7.2
9.7.3
9.8
9.9
9.10
9.11
9.12
9.12.1
9.12.2
9.12.3
9.12.4
Pulse-Width Modulator for Motor Control (PWMMC)
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .140
Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .141
Timebase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .146
Output Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .152
Fault Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .161
Initialization and the PWMEN Bit. . . . . . . . . . . . . . . . . . . . .169
PWM Operation in Wait Mode . . . . . . . . . . . . . . . . . . . . . . .170
PWM Operation in Stop Mode . . . . . . . . . . . . . . . . . . . . . . .170
PWM Operation in Break Mode . . . . . . . . . . . . . . . . . . . . . .171
PWM Generators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .148
Control Logic Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .172
Resolution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .146
Prescaler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .148
Load Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .148
PWM Data Overflow and Underflow Conditions . . . . . .152
Selecting Six Independent PWMs or Three
Complementary PWM Pairs. . . . . . . . . . . . . . . . . . . . . . .152
Dead-Time Insertion. . . . . . . . . . . . . . . . . . . . . . . . . . . . .154
Output Polarity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .157
Output Port Control Register . . . . . . . . . . . . . . . . . . . . .159
Fault Condition Input Pins. . . . . . . . . . . . . . . . . . . . . . . .164
Software Output Disable . . . . . . . . . . . . . . . . . . . . . . . . .168
Output Port Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . .168
PWM Counter Registers . . . . . . . . . . . . . . . . . . . . . . . . .172
PWM Counter Modulo Registers. . . . . . . . . . . . . . . . . . .173
PWMx Value Registers. . . . . . . . . . . . . . . . . . . . . . . . . . .174
PWM Control Register 1 . . . . . . . . . . . . . . . . . . . . . . . . .175
(PWMMC)
Technical Data
139
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