DK-LM3S817 View Datasheet(PDF) - Unspecified

Part Name

Description

MFG CO.

DK-LM3S817

Microcontroller

Unspecified 

Architectural Overview

1.4.3

1.4.3.1

1.4.3.2

1.4.4

1.4.4.1

Each PWM generator block produces two PWM signals that can either be independent signals or

a single pair of complementary signals with dead-band delays inserted. The output of the PWM

generation blocks are managed by the output control block before being passed to the device pins.

CCP Pins (“16-Bit PWM Mode” on page 162)

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 LM3S817 controller offers an Analog-to-Digital Converter (ADC) and

an analog comparator.

ADC (Section 11 on page 208)

An analog-to-digital converter (ADC) is a peripheral that converts a continuous analog voltage to a

discrete digital number.

The Stellaris ADC module features 10-bit conversion resolution and supports six input channels,

plus an internal temperature sensor. Four buffered sample sequences allow rapid sampling of up

to six analog input sources without controller intervention. Each sample sequence provides flexible

programming with fully configurable input source, trigger events, interrupt generation, and

sequence priority.

Analog Comparator (Section 14 on page 309)

An analog comparator is a peripheral that compares two analog voltages, and provides a logical

output that signals the comparison result.

The LM3S817 controller provides one independent integrated analog comparator that can be

configured to drive an output or generate an interrupt or ADC event.

A comparator can compare a test voltage against any one of these voltages:

„ An individual external reference voltage

„ A single external reference voltage

„ A shared internal reference voltage

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 or triggers to the

ADC to cause it to start capturing a sample sequence. The interrupt generation and ADC triggering

logic is separate. This means, for example, that an interrupt can be generated on a rising edge and

the ADC triggered on a falling edge.

Serial Communications Peripherals

The LM3S817 controller supports both asynchronous and synchronous serial communications

with two fully programmable 16C550-type UARTs and SSI serial communications.

UART (Section 12 on page 238)

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 LM3S817 controller includes two fully programmable 16C550-type UARTs that support data

transfer speeds up to 460.8 Kbps. (Although similar in functionality to a 16C550 UART, it is not

register compatible.)

28

May 4, 2007

Preliminary

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