LM3S6911-EBZ50-A2T Datasheet PDF - TI

Architectural Overview

●The 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 LM3S6911 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

●– 30 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

●■ ARM® Cortex™-M3 Processor Core

●– Compact core.

●– Thumb-2 instruction set, delivering the high-performance expected of an ARM core in the memory size usually associated with 8- and 16-bit devices; typically in the range of a few kilobytes of memory for microcontroller class applications.

●– Rapid application execution through Harvard architecture characterized by separate buses for instruction and data.

●– Exceptional interrupt handling, by implementing the register manipulations required for handling an interrupt in hardware.

●– Deterministic, fast interrupt processing: always 12 cycles, or just 6 cycles with tail-chaining

●– Memory protection unit (MPU) to provide a privileged mode of operation for complex applications.

●– Migration from the ARM7™ processor family for better performance and power efficiency.

●– Full-featured debug solution

●• Serial Wire JTAG Debug Port (SWJ-DP)

●• Flash Patch and Breakpoint (FPB) unit for implementing breakpoints

●• Data Watchpoint and Trigger (DWT) unit for implementing watchpoints, trigger resources, and system profiling

●• Instrumentation Trace Macrocell (ITM) for support of printf style debugging

●• Trace Port Interface Unit (TPIU) for bridging to a Trace Port Analyzer

●– Optimized for single-cycle flash usage

●– Three sleep modes with clock gating for low power

●– Single-cycle multiply instruction and hardware divide

●– Atomic operations

●– ARM Thumb2 mixed 16-/32-bit instruction set

●– 1.25 DMIPS/MHz

●■ JTAG

●– IEEE 1149.1-1990 compatible Test Access Port (TAP) controller

●– Four-bit Instruction Register (IR) chain for storing JTAG instructions

●– IEEE standard instructions: BYPASS, IDCODE, SAMPLE/PRELOAD, EXTEST and INTEST

●– ARM additional instructions: APACC, DPACC and ABORT

●– Integrated ARM Serial Wire Debug (SWD)

●■ Hibernation

●– System power control using discrete external regulator

●– Dedicated pin for waking from an external signal

●– Low-battery detection, signaling, and interrupt generation

●– 32-bit real-time clock (RTC)

●– Two 32-bit RTC match registers for timed wake-up and interrupt generation

●– Clock source from a 32.768-kHz external oscillator or a 4.194304-MHz crystal

●– RTC predivider trim for making fine adjustments to the clock rate

●– 64 32-bit words of non-volatile memory

●– Programmable interrupts for RTC match, external wake, and low battery events

●■ 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

●■ GPIOs

●– 10-46 GPIOs, depending on configuration

●– 5-V-tolerant in input configuration

●– Fast toggle capable of a change every two clock cycles

●– Programmable control for GPIO interrupts

●  • Interrupt generation masking

●  • Edge-triggered on rising, falling, or both

●  • Level-sensitive on High or Low values

●– Bit masking in both read and write operations through address lines

●– Pins configured as digital inputs are Schmitt-triggered.

●– Programmable control for GPIO pad configuration

●  • Weak pull-up or pull-down resistors

●  • 2-mA, 4-mA, and 8-mA pad drive for digital communication; up to four pads can be configured with an 18-mA pad drive for high-current applications

●  • Slew rate control for the 8-mA drive

●  • Open drain enables

●  • Digital input enables