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CONTENTS
7.4.5 Determining Serial Port Status ................................................................................7-15
CHAPTER 8
FREQUENCY GENERATOR
8.1 FUNCTIONAL OVERVIEW............................................................................................ 8-1
8.2 PROGRAMMING THE FREQUENCY GENERATOR ................................................... 8-3
8.2.1 Configuring the Output ..............................................................................................8-3
8.2.2 Programming the Frequency ....................................................................................8-3
8.2.3 Determining the Current Value of the Down-counter ................................................8-4
8.3 APPLICATION EXAMPLE............................................................................................. 8-4
CHAPTER 9
WAVEFORM GENERATOR
9.1 WAVEFORM GENERATOR FUNCTIONAL OVERVIEW.............................................. 9-1
9.2 WAVEFORM GENERATOR SIGNALS AND REGISTERS........................................... 9-3
9.3 WAVEFORM GENERATOR OPERATION.................................................................... 9-4
9.3.1 Timebase Generator .................................................................................................9-4
9.3.2 Phase Driver Channels .............................................................................................9-5
9.3.3 Control and Protection Circuitry ................................................................................9-5
9.3.4 Register Buffering and Synchronization ....................................................................9-6
9.3.5 Operating Modes ......................................................................................................9-7
9.3.5.1 Center-aligned Modes ..........................................................................................9-9
9.3.5.2 Edge-Aligned Modes ..........................................................................................9-10
9.4 PROGRAMMING THE WAVEFORM GENERATOR................................................... 9-12
9.4.1 Configuring the Outputs ..........................................................................................9-12
9.4.2 Controlling the Protection Circuitry and EXTINT Interrupt Generation ....................9-15
9.4.3 Specifying the Carrier Period and Duty Cycle .........................................................9-16
9.4.4 Specifying the Operating Mode and Dead Time and Starting the Counter .............9-17
9.5 DETERMINING THE WAVEFORM GENERATOR’S STATUS ................................... 9-19
9.6 ENABLING THE WAVEFORM GENERATOR INTERRUPTS..................................... 9-19
9.7 DESIGN CONSIDERATIONS...................................................................................... 9-20
9.7.1 Dead Time and Duty Cycle .....................................................................................9-20
9.7.2 EXTINT Interrupts and Protection Circuitry .............................................................9-21
9.8 PROGRAMMING EXAMPLE....................................................................................... 9-21
CHAPTER 10
PULSE-WIDTH MODULATOR
10.1 PWM FUNCTIONAL OVERVIEW................................................................................ 10-1
10.2 PWM SIGNALS AND REGISTERS ............................................................................. 10-2
10.3 PWM OPERATION...................................................................................................... 10-3
10.4 PROGRAMMING THE FREQUENCY AND PERIOD.................................................. 10-4
10.5 PROGRAMMING THE DUTY CYCLE......................................................................... 10-6
10.5.1 Sample Calculations ...............................................................................................10-7