Microchip dsPIC33EP256MC204 Bedienungsanleitung

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© 2010-2011 Microchip Technology Inc. DS70645C-page 14-1
High-Speed PWM
14
Section 14. High-Speed PWM
HIGHLIGHTS
This section of the manual contains the following major topics:
14.1 Introduction .................................................................................................................. 14-2
14.2 Features....................................................................................................................... 14-2
14.3 Control Registers ......................................................................................................... 14-3
14.4 Architecture Overview................................................................................................ 14-24
14.5 Module Description .................................................................................................... 14-27
14.6 PWM Operating Modes.............................................................................................. 14-33
14.7 PWM Generator......................................................................................................... 14-71
14.8 PWM Trigger.............................................................................................................. 14-87
14.9 PWM Interrupts.......................................................................................................... 14-98
14.10 PWM Fault Pins ......................................................................................................... 14-99
14.11 Special Features ...................................................................................................... 14-105
14.12 PWM Output Pin Control...........................................................................................14-111
14.13 Immediate Update of PWM Duty Cycle ................................................................... 14-113
14.14 Power-Saving Modes............................................................................................... 14-114
14.15 External Control of Individual Time Base(s)............................................................. 14-114
14.16 Application Information ............................................................................................ 14-115
14.17 Register Map............................................................................................................ 14-126
14.18 Related Application Notes........................................................................................ 14-127
14.19 Revision History ....................................................................................................... 14-128
dsPIC33E/PIC24E Family Reference Manual
DS70645C-page 14-2 © 2010-2011 Microchip Technology Inc.
14.1 INTRODUCTION
This section describes the High-Speed Pulse-Width Modulator (PWM) module and its
associated operational modes. The High-Speed PWM module in the dsPIC33E/PIC24E
device family supports a wide variety of PWM modes and is ideal for power
conversion/motor control applications. Some of the common applications include:
AC-to-DC converters
DC-to-DC converters
AC and DC motors: BLDC, PMSM, ACIM, SRM, etc.
• Inverters
Battery chargers
Digital lighting
Uninterrupted Power Supply (UPS)
Power Factor Correction (PFC) (e.g., Interleaved PFC and Bridgeless PFC)
14.2 FEATURES
The High-Speed PWM module consists of the following major features:
Up to seven PWM generators, each with an individual time base
Two PWM outputs per PWM generator
Individual period and duty cycle for each PWM output
Duty cycle, dead time, phase shift and frequency resolution equal to the system clock
source (TOSC)
Independent fault and current-limit inputs for up to 14 PWM outputs
Redundant Output mode
Independent Output mode (this feature is not available on all devices)
Push-Pull Output mode
Complementary Output mode
Center-Aligned PWM mode
Output override control
Special Event Trigger
PWM capture feature
Prescaler for input clock
ADC triggering with PWM
Independent PWM frequency, duty cycle and phase shift changes
Leading-Edge Blanking (LEB) functionality
Dead time compensation
Output clock chopping
Note: This family reference manual section is meant to serve as a complement to device
data sheets. Depending on the device variant, this manual section may not apply to
all dsPIC33E/PIC24E devices.
Please consult the note at the beginning of the “High-Speed PWM” chapter in the
current device data sheet to check whether this document supports the device you
are using.
Device data sheets and family reference manual sections are available for
download from the Microchip Worldwide Web site at: http://www.microchip.com
© 2010-2011 Microchip Technology Inc. DS70645C-page 14-3
Section 14. High-Speed PWM
High-Speed PWM
14
14.3 CONTROL REGISTERS
The following registers control the operation of the High-Speed PWM module:
PTCON: PWM Time Base Control Register
- Enables or disables the High-Speed PWM module
- Sets the Special Event Trigger for the ADC
- Enables or disables immediate period updates
- Selects the synchronizing source for the master time base
- Specifies synchronization settings
PTCON2: PWM Clock Divider Select Register 2
Provides the clock prescaler to the PWM master time base
PTPER: Primary Master Time Base Period Register
Provides the PWM time period value
STCON: PWM Secondary Master Time Base Control Registe (1)
- Enables or disables immediate period updates based on the secondary master time base
- Selects the synchronization source for the secondary master time base
- Specifies the synchronization setting for secondary master time base control
STCON2: PWM Secondary Clock Divider Select Register 2(1)
Provides the clock prescaler to the PWM secondary master time base
STPER: Secondary Master Time Base Period Register(1)
Provides the secondary master time base period value
MDC: PWM Master Duty Cycle Register
Provides the PWM master duty cycle value
SEVTCMP: PWM Special Event Compare Register
Provides the compare value that is used to trigger the ADC module
SSEVTCMP: PWM Secondary Special Event Compare Register(1)
Provides the compare value that is used to trigger the ADC module based on the
secondary master time base
CHOP: PWM Chop Clock Generator Register
- Provides the chop clock frequency
- Enables or disables the chop clock generator
PWMKEY: PWM Unlock Register(1)
Writes the unlock sequence to allow writes to the IOCONx and FCLCONx registers
PWMCONx: PWM Control Register
- Enables or disables fault interrupt, current-limit interrupt and primary trigger interrupt
- Provides the interrupt status for fault interrupt, current-limit interrupt and primary trigger
interrupt
- Selects the type of time base (master time base or independent time base)
- Selects the type of duty cycle (master duty cycle or independent duty cycle)
- Controls Dead Time mode
- Enables or disables Center-Aligned mode
- Controls the external PWM Reset operation
- Enables or disables immediate updates of the duty cycle, phase offset, independent time
base period
IOCONx: PWM I/O Control Register
- Enables or disables PWM pin control feature (PWM control or GPIO)
- Controls fault/current limit override values
- Enables PWMxH and PWMxL pin swapping
- Controls the PWMxH and PWMxL output polarity
- Controls the PWMxH and PWMxL output if any of the following modes is selected:
Complementary mode
Push-Pull mode
True Independent mode
Note: Not all registers are available on all devices. Refer to the “High-Speed PWM”
chapter in the specific device data sheet for availability.


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Modell: dsPIC33EP256MC204

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