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1、TMS320x280x, 2801x, 2804x High Resolution Pulse Width Modulator Reference Guide Literature Number: SPRU924E April 2005Revised February 2009 2SPRU924EApril 2005Revised February 2009 Submit Documentation Feedback Contents Preface5 1Introduction.9 2Operational Description of HRPWM10 2.1Controlling the
2、HRPWM Capabilities10 2.2Configuring the HRPWM.12 2.3Principle of Operation.12 2.4Scale Factor Optimizing Software (SFO).16 2.5HRPWM Examples Using Optimized Assembly Code21 3HRPWM Register Descriptions.27 3.1Register Summary.27 3.2Registers and Field Descriptions28 Appendix A Revision History30 Appe
3、ndix B SFO Library Software - SFO_TI_Build_V5.lib.31 B.1SFO library Version Comparison31 B.2Software Usage34 SPRU924EApril 2005Revised February 2009Table of Contents3 Submit Documentation Feedback List of Figures 1Resolution Calculations for Conventionally Generated PWM9 2Operating Logic Using MEP10
4、 3HRPWM Extension Registers and Memory Configuration11 4HRPWM System Interface11 5Required PWM Waveform for a Requested Duty = 40.5%.13 6Low % Duty Cycle Range Limitation Example When PWM Frequency = 1 MHz.15 7High % Duty Cycle Range Limitation Example when PWM Frequency = 1 MHz.16 8Simple Buck Cont
5、rolled Converter Using a Single PWM.22 9PWM Waveform Generated for Simple Buck Controlled Converter.22 10Simple Reconstruction Filter for a PWM Based DAC.24 11PWM Waveform Generated for the PWM DAC Function.24 12HRPWM Configuration Register (HRCNFG).28 13Counter Compare A High Resolution Register (C
6、MPAHR).28 14TB Phase High Resolution Register (TBPHSHR)29 List of Tables 1Resolution for PWM and HRPWM.9 2HRPWM Registers.10 3Relationship Between MEP Steps, PWM Frequency and Resolution.12 4CMPA vs Duty (left), and CMPA:CMPAHR vs Duty (right)13 5Duty Cycle Range Limitation for 3 and 6 SYSCLK/TBCLK
7、Cycles16 6SFO Library Routines17 7Factor Values.19 8Register Descriptions27 9HRPWM Configuration Register (HRCNFG) Field Descriptions.28 10Counter Compare A High Resolution Register (CMPAHR) Field Descriptions28 11TB Phase High Resolution Register (TBPHSHR) Field Descriptions.29 A-1Technical Changes
8、 in the Current Revision30 B-1SFO library Version Comparison.31 B-2SFO V5 Library Routines32 B-3Software Functions.34 List of Figures4SPRU924EApril 2005Revised February 2009 Submit Documentation Feedback Preface SPRU924EApril 2005Revised February 2009 Read This First About This Manual This document
9、describes the operation of the high-resolution extension to the pulse width modulator (HRPWM). The HRPWM module described in this reference guide is a Type 0 HRPWM. See the TMS320x28xx, 28xxx DSP Peripheral Reference Guide (SPRU566) for a list of all devices with an HRPWM module of the same type, to
10、 determine the differences between types, and for a list of device-specific differences within a type. Notational Conventions This document uses the following conventions. Hexadecimal numbers are shown with the suffix h. For example, the following number is 40 hexadecimal (decimal 64): 40h. Register
11、s in this document are shown in figures and described in tables. Each register figure shows a rectangle divided into fields that represent the fields of the register. Each field is labeled with its bit name, its beginning and ending bit numbers above, and its read/write properties below. A legend ex
12、plains the notation used for the properties. Reserved bits in a register figure designate a bit that is used for future device expansion. Related Documentation From Texas Instruments The following documents describe the C2000 devices and related support tools. Copies of these documents are available
13、 on the Internet at . Tip: Enter the literature number in the search box provided at . The current documentation that describes the devices, related peripherals, and other technical collateral, is available in the C2000 DSP product folder at: Data Manuals SPRS230 TMS320F2809, F2808, F2806, F2802, F2
14、801, C2802, C2801, and F2801x DSPs Data Manual contains the pinout, signal descriptions, as well as electrical and timing specifications for the F280x devices. SPRZ171 TMS320F280x, TMS320C280x, and TMS320F2801x DSP Silicon Errata describes the advisories and usage notes for different versions of sil
15、icon. SPRS357 TMS320F28044 Digital Signal Processor Data Manual contains the pinout, signal descriptions, as well as electrical and timing specifications for the F28044 device. SPRZ255 TMS320F28044 DSP Silicon Errata describes the advisories and usage notes for different versions of silicon. CPU Use
16、rs Guides SPRU430 TMS320C28x DSP CPU and Instruction Set Reference Guide describes the central processing unit (CPU) and the assembly language instructions of the TMS320C28x fixed-point digital signal processors (DSPs). It also describes emulation features available on these DSPs. SPRU712 TMS320x280x, 2801x, 2804x System Control and Interrupts Reference Guide describes the various interrupts and system control features of the 280x digital signal processors (DSPs).
