LM3S2730 Luminary Micro, Inc, LM3S2730 Datasheet - Page 29

• Manufacturer Part Number: LM3S2730
• Description: Lm3s2730 Arm Microcontroller
• Manufacturer: Luminary Micro, Inc

1.4.2.1
1.4.3
1.4.3.1
1.4.4
1.4.4.1
July 25, 2008
PWM
Pulse width modulation (PWM) is a powerful technique for digitally encoding analog signal levels.
High-resolution counters are used to generate a square wave, and the duty cycle of the square
wave is modulated to encode an analog signal. Typical applications include switching power supplies
and motor control.
On the LM3S2730, PWM motion control functionality can be achieved through:
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CCP Pins (see page 180)
The General-Purpose Timer Module's CCP (Capture Compare PWM) pins are software programmable
to support a simple PWM mode with a software-programmable output inversion of the PWM signal.
Analog Peripherals
For support of analog signals, the LM3S2730 microcontroller offers two analog comparators.
Analog Comparators (see page 352)
An analog comparator is a peripheral that compares two analog voltages, and provides a logical
output that signals the comparison result.
The LM3S2730 microcontroller provides two independent integrated analog comparators that can
be configured to drive an output or generate an interrupt .
A comparator can compare a test voltage against any one of these voltages:
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The comparator can provide its output to a device pin, acting as a replacement for an analog
comparator on the board, or it can be used to signal the application via interrupts to cause it to start
capturing a sample sequence.
Serial Communications Peripherals
The LM3S2730 controller supports both asynchronous and synchronous serial communications
with:
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UART (see page 233)
A Universal Asynchronous Receiver/Transmitter (UART) is an integrated circuit used for RS-232C
serial communications, containing a transmitter (parallel-to-serial converter) and a receiver
(serial-to-parallel converter), each clocked separately.
The motion control features of the general-purpose timers using the CCP pins
An individual external reference voltage
A shared single external reference voltage
A shared internal reference voltage
One fully programmable 16C550-type UART
One SSI module
One CAN unit
Preliminary
LM3S2730 Microcontroller
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