LM3S2939 Datasheet, PDF (610/749 Pages) Texas Instruments – Stellaris® LM3S2939 Microcontroller

Pulse Width Modulator (PWM)
17.1
■ 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
– Interrupt status summary of the PWM generator blocks
■ Can initiate an ADC sample sequence
Block Diagram
Figure 17-1 on page 610 provides the Stellaris PWM module unit diagram and Figure 17-2 on page 611
provides a more detailed diagram of a Stellaris PWM generator. The LM3S2939 controller contains
two generator blocks (PWM0 and PWM1) and generates four independent PWM signals or two
paired PWM signals with dead-band delays inserted.
Figure 17-1. PWM Unit Diagram
PWM Clock
Fault
System Clock
Control and
Status
PWMCTL
PWMSYNC
PWMSTATUS
PWM0_A
PWM
PWM0_B
Generator 0
PWM0_Fault
PWM1_A
PWM
PWM1_B
Generator 1
PWM1_Fault
PWM
Output
Control
Logic
PWM 0
PWM 1
PWM 2
PWM 3
Interrupts
Triggers
Interrupt
PWMINTEN
PWMRIS
PWMISC
Output
PWMENABLE
PWMINVERT
PWMFAULT
610
June 18, 2012
Texas Instruments-Production Data