LM-3  -  Series DataSheet
LM3S101-ERN20-T  -  The Stellaris? family of microcontrollers—the first ARM? Cortex?-M3 based controllers—brings high-performance 32-bit computing to cost-sensitive embedded microcontrolle  -  Texas Instruments Incorporated  -  ARM

Features
The LM3S101 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
– 20-MHz operation
– Hardware-division and single-cycle-multiplication
– Integrated Nested Vectored Interrupt Controller (NVIC) providing deterministic interrupt handling
– 14 interrupts with eight priority levels
– 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
– 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)
■ Internal Memory
– 8 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
– 2 KB single-cycle SRAM
■ GPIOs
– 2-18 GPIOs, depending on configuration
– 5-V-tolerant input/outputs
– 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
• Slew rate control for the 8-mA drive
• Open drain enables
• Digital input enables
■ General-Purpose Timers
– Two 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)
– 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
• Software-controlled event stalling (excluding RTC mode)
• User-managed flash data programming
• User-defined and managed flash-protection block
– 2 KB single-cycle SRAM
■ GPIOs
– 2-18 GPIOs, depending on configuration
– 5-V-tolerant input/outputs
– 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
• Slew rate control for the 8-mA drive
• Open drain enables
• Digital input enables
■ General-Purpose Timers
– Two 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)
– 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
• Software-controlled event stalling (excluding RTC mode) 22 October 05, 2009
Texas Instruments-Production Data
Architectural Overview
– 16-bit Timer modes
• General-purpose timer function with an 8-bit prescaler (for one-shot and periodic modes only)
• Programmable one-shot timer
• Programmable periodic timer
• User-enabled stalling when the controller asserts CPU Halt flag during debug
– 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
■ UART
– Fully programmable 16C550-type UART
– Separate 16x8 transmit (TX) and receive (RX) FIFOs to reduce CPU interrupt service loading
– Programmable baud-rate generator allowing speeds up to 1.25 Mbps
– 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
– Fully programmable serial interface characteristics
• 5, 6, 7, or 8 data bits
• Even, odd, stick, or no-parity bit generation/detection
• 1 or 2 stop bit generation
■ 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
■ Analog Comparators
– Two independent integrated analog comparators
– Configurable for output to drive an output pin or generate an interrupt
– Compare external pin input to external pin input or to internal programmable voltage reference
– Compare a test voltage against any one of these voltages
• An individual external reference voltage
• A shared single external reference voltage
• A shared internal reference voltage
■ Power
– On-chip Low Drop-Out (LDO) voltage regulator, with programmable output user-adjustable from 2.25 V to 2.75 V
– Low-power options on controller: Sleep and Deep-sleep modes
– Low-power options for peripherals: software controls shutdown of individual peripherals
– User-enabled LDO unregulated voltage detection and automatic reset
– 3.3-V supply brown-out detection and reporting via interrupt or reset
■ Flexible Reset Sources
– Power-on reset (POR)
– Reset pin assertion
– Brown-out (BOR) detector alerts to system power drops
– Software reset
– Watchdog timer reset
– Internal low drop-out (LDO) regulator output goes unregulated
■ Industrial and extended temperature 28-pin RoHS-compliant SOIC package1
■ Industrial and extended temperature 48-pin RoHS-compliant LQFP package
■ Industrial and extended temperature 48-pin RoHS-compliant QFN package
1.2 Target Applications
■ Factory automation and control
■ Industrial control power devices
■ Building and home automation
■ Stepper motors
■ Brushless DC motors
■ AC induction motors
1.3 High-Level Block Diagram
Figure 1-1 on page 26 depicts the features on the Stellaris® LM3S101 microcontroller.