LM3S3749 Datasheet, PDF (46/898 Pages) Texas Instruments – Stellaris® LM3S3749 Microcontroller

Architectural Overview
• One endpoint may be defined for double-buffered 1023-byte isochronous packet size
■ Analog Comparators
– Two independent integrated analog comparators
– 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
– Compare a test voltage against any one of these voltages
• An individual external reference voltage
• A shared single external reference voltage
• A shared internal reference voltage
■ PWM
– Four PWM generator blocks, each with one 16-bit counter, two PWM comparators, a PWM
signal generator, a dead-band generator, and an interrupt/ADC-trigger selector
– Four fault inputs in hardware to promote low-latency shutdown
– One 16-bit counter
• 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
– Two PWM comparators
• Comparator value updates can be synchronized
• Produces output signals on match
– PWM generator
• 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
– Dead-band generator
• Produces two PWM signals with programmable dead-band delays suitable for driving a
half-H bridge
• Can be bypassed, leaving input PWM signals unmodified
– Flexible output control block with PWM output enable of each PWM signal
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November 17, 2011
Texas Instruments-Production Data