LM3S8971 Luminary Micro, Inc, LM3S8971 Datasheet - Page 30

• Manufacturer Part Number: LM3S8971
• Description: Lm3s8971 Arm Microcontroller
• Manufacturer: Luminary Micro, Inc

Architectural Overview
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PWM
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QEI
Configurable for output to: drive an output pin, generate an interrupt, or initiate an ADC sample
sequence
Compare external pin input to external pin input or to internal programmable voltage reference
Three PWM generator blocks, each with one 16-bit counter, two comparators, a PWM
generator, and a dead-band generator
One 16-bit counter
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Two PWM comparators
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PWM generator
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Dead-band generator
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Flexible output control block with PWM output enable of each PWM signal
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Can initiate an ADC sample sequence
Runs in Down or Up/Down mode
Output frequency controlled by a 16-bit load value
Load value updates can be synchronized
Produces output signals at zero and load value
Comparator value updates can be synchronized
Produces output signals on match
Output PWM signal is constructed based on actions taken as a result of the counter and
PWM comparator output signals
Produces two independent PWM signals
Produces two PWM signals with programmable dead-band delays suitable for driving a
half-H bridge
Can be bypassed, leaving input PWM signals unmodified
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
Synchronization of timer/comparator updates across the PWM generator blocks
Interrupt status summary of the PWM generator blocks
Preliminary
July 26, 2008