LM3S3749 Datasheet, PDF (736/898 Pages) Texas Instruments – Stellaris® LM3S3749 Microcontroller

Pulse Width Modulator (PWM)
18.1
■ Flexible output control block with PWM output enable of each PWM signal
– PWM output enable of each PWM signal
– Optional output inversion of each PWM signal (polarity control)
– Optional fault handling for each PWM signal
– Synchronization of timers in the PWM generator blocks
– Extended PWM synchronization of timer/comparator updates across the PWM generator
blocks
– Interrupt status summary of the PWM generator blocks
– Extended PWM fault handling, with multiple fault signals, programmable polarities, and filtering
■ Can initiate an ADC sample sequence
Block Diagram
Figure 18-1 on page 736 provides the Stellaris PWM module unit diagram and Figure 18-2 on page 737
provides a more detailed diagram of a Stellaris PWM generator. The LM3S3749 controller contains
four generator blocks (PWM0, PWM1, PWM2, and PWM3) and generates eight independent PWM
signals or four paired PWM signals with dead-band delays inserted.
Figure 18-1. PWM Unit Diagram
PWM Clock
Faults
System Clock
Control and
Status
PWMCTL
PWMSYNC
PWMSTATUS
Interrupts
Triggers
Interrupt
PWMINTEN
PWMRIS
PWMISC
Output
PWMENABLE
PWMINVERT
PWMFAULT
PWMFAULTVAL
PWM0_A
PWM
PWM0_B
Generator 0
PWM0_Fault
PWM1_A
PWM
PWM1_B
Generator 1
PWM1_Fault
PWM2_A
PWM
PWM2_B
Generator 2
PWM2_Fault
PWM3_A
PWM
PWM3_B
Generator 3
PWM3_Fault
PWM 0
PWM 1
PWM
Output
Control
Logic
PWM 2
PWM 3
PWM 4
PWM 5
PWM 6
PWM 7
736
November 17, 2011
Texas Instruments-Production Data