[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.

The Stellaris® family offers efficient performance and extensive integration, favorably positioning the device into cost-conscious applications requiring significant control-processing and connectivity capabilities. The Stellaris® LM3S1000 series extends the Stellaris® family with larger on-chip memories, enhanced power management, and expanded I/O and control capabilities. The Stellaris® LM3S2000 series, designed for Controller Area Network (CAN) applications, extends the Stellaris family with Bosch CAN networking technology, the golden standard in short-haul industrial networks.

Product Features

The LM3S2965 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 (SysTick), 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

– 42 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)

• To 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

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