LM3S1607 Luminary Micro, Inc, LM3S1607 Datasheet - Page 31

• Manufacturer Part Number: LM3S1607
• Description: Lm3s1607 Arm Microcontroller
• Manufacturer: Luminary Micro, Inc

1.4.2
1.4.2.1
1.4.3
1.4.3.1
1.4.4
1.4.4.1
June 02, 2008
Motor Control Peripherals
To enhance motor control, the LM3S1607 controller features Pulse Width Modulation (PWM) outputs.
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 LM3S1607, PWM motion control functionality can be achieved through:
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CCP Pins (see page 288)
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
To handle analog signals, the LM3S1607 microcontroller offers an Analog-to-Digital Converter
(ADC).
ADC (see page 339)
An analog-to-digital converter (ADC) is a peripheral that converts a continuous analog voltage to a
discrete digital number.
The LM3S1607 ADC module features 10-bit conversion resolution and supports eight input channels,
plus an internal temperature sensor. Four buffered sample sequences allow rapid sampling of up
to eight analog input sources without controller intervention. Each sample sequence provides flexible
programming with fully configurable input source, trigger events, interrupt generation, and sequence
priority.
Serial Communications Peripherals
The LM3S1607 controller supports both asynchronous and synchronous serial communications
with:
■
■
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UART (see page 371)
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 LM3S1607 controller includes three fully programmable 16C550-type UARTs that support data
transfer speeds up to 3.125 Mbps. (Although similar in functionality to a 16C550 UART, it is not
register-compatible.) In addition, each UART is capable of supporting IrDA.
Separate 16x8 transmit (TX) and 16x12 receive (RX) FIFOs reduce CPU interrupt service loading.
The UART can generate individually masked interrupts from the RX, TX, modem status, and error
The motion control features of the general-purpose timers using the CCP pins
Three fully programmable 16C550-type UARTs
One SSI module
Two I
2
C modules
Preliminary
LM3S1607 Microcontroller
31