[Luminary Micro, Inc.]

Architectural Overview

The Luminary Micro Stellaris® family of microcontrollers—the first ARM® Cortex™-M3 based controllers—brings high-performance 32-bit computing to cost-sensitive embedded microcontroller applications. These pioneering parts deliver customers 32-bit performance at a cost equivalent to legacy 8- and 16-bit devices, all in a package with a small footprint.

Product Features

The LM3S6965 microcontroller includes the following product features:

■ 32-Bit RISC Performance

– 32-bit ARM® Cortex™-M3 v7M architecture optimized for small-footprint embedded

applications

– System timer (SysT ick), providing a simple, 24-bit clear-on-write, decrementing,

wrap-on-zero counter with a flexible control mechanism

– Thumb®-compatible Thumb-2-only instruction set processor core for high code density

– 50-MHz operation

– Hardware-division and single-cycle-multiplication

– Integrated Nested Vectored Interrupt Controller (NVIC) providing deterministic interrupt

handling

– 38 interrupts with eight priority levels

– Memory protection unit (MPU), providing a privileged mode for protected operating system

functionality

– Unaligned data access, enabling data to be efficiently packed into memory

– Atomic bit manipulation (bit-banding), delivering maximum memory utilization

and streamlined peripheral control

■ Internal Memory

– 256 KB single-cycle flash

• User-managed flash block protection on a 2-KB block basis

• User-managed flash data programming

• User-defined and managed flash-protection block

– 64 KB single-cycle SRAM

■ General-Purpose Timers

– Four General-Purpose Timer Modules (GPTM), each of which provides two 16-bit timers.

Each GPTM can be configured to operate independently:

• As a single 32-bit timer

• As one 32-bit Real-Time Clock (RTC) to event capture

• For Pulse Width Modulation (PWM)

• T o trigger analog-to-digital conversions

– 32-bit Timer modes

• Programmable one-shot timer

• Programmable periodic timer

• Real-Time Clock when using an external 32.768-KHz clock as the input

• User-enabled stalling in periodic and one-shot mode when the controller asserts the

CPU Halt flag during debug

• ADC event trigger

– 16-bit Timer modes

• General-purpose timer function with an 8-bit prescaler

• Programmable one-shot timer

• Programmable periodic timer

• User-enabled stalling when the controller asserts CPU Halt flag during debug

• ADC event trigger

– 16-bit Input Capture modes

• Input edge count capture

• Input edge time capture

– 16-bit PWM mode

• Simple PWM mode with software-programmable output inversion of the PWM signal

■ ARM FiRM-compliant Watchdog Timer

– 32-bit down counter with a programmable load register

– Separate watchdog clock with an enable

– Programmable interrupt generation logic with interrupt masking

– Lock register protection from runaway software

– Reset generation logic with an enable/disable

– User-enabled stalling when the controller asserts the CPU Halt flag during debug

■ 10/100 Ethernet Controller

– Conforms to the IEEE 802.3-2002 Specification

– Full- and half-duplex for both 100 Mbps and 10 Mbps operation

– Integrated 10/100 Mbps Transceiver (PHY)

– Automatic MDI/MDI-X cross-over correction

– Programmable MAC address

– Power-saving and power-down modes

■ Synchronous Serial Interface (SSI)

– Master or slave operation

– Programmable clock bit rate and prescale

– Separate transmit and receive FIFOs, 16 bits wide, 8 locations deep

– Programmable interface operation for Freescale SPI, MICROWIRE, or

Texas Instruments synchronous serial interfaces

– Programmable data frame size from 4 to 16 bits

– Internal loopback test mode for diagnostic/debug testing

■ UART

– Three fully programmable 16C550-type UART s with IrDA support

– Separate 16x8 transmit (TX) and 16x12 receive (RX) FIFOs to reduce

CPU interrupt service loading

– Programmable baud-rate generator with fractional divider

– Programmable FIFO length, including 1-byte deep operation providing conventional

double-buffered interface

– FIFO trigger levels of 1/8, 1/4, 1/2, 3/4, and 7/8

– Standard asynchronous communication bits for start, stop, and parity

– False-start-bit detection

– Line-break generation and detection

■ ADC

– Single- and differential-input configurations

– Four 10-bit channels (inputs) when used as single-ended inputs

– Sample rate of one million samples/second

– Flexible, configurable analog-to-digital conversion

– Four programmable sample conversion sequences from one to eight entries long,

with corresponding conversion result FIFOs

– Each sequence triggered by software or internal event (timers, analog comparators,

PWM or GPIO)

– On-chip temperature sensor

■ 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

Target Applications

■ Remote monitoring

■ Electronic point-of-sale (POS) machines

■ T est and measurement equipment

■ Network appliances and switches

■ Factory automation

■ HVAC and building control

■ Gaming equipment

■ Motion control

■ Medical instrumentation

■ Fire and security