Architectural Overview
20
May 4, 2007
Preliminary
1
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 LM3S317 controller in the Stellaris family offers the advantages of ARM’s widely available
development tools, System-on-Chip (SoC) infrastructure IP applications, and a large user
community. Additionally, the controller uses ARM’s Thumb®-compatible Thumb-2 instruction set to
reduce memory requirements and, thereby, cost.
Luminary Micro offers a complete solution to get to market quickly, with a customer development
board, white papers and application notes, and a strong support, sales, and distributor network.
1.1
Product Features
The LM3S317 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) provides 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
– 25-MHz operation
– Hardware-division and single-cycle-multiplication
– Integrated Nested Vectored Interrupt Controller (NVIC) providing deterministic interrupt
handling
– 25 interrupts with eight priority levels
– Memory protection unit (MPU) provides a privileged mode for protected operating system
functionality
– Unaligned data access, enabling data to be efficiently packed into memory
– Atomic bit manipulation (bit-banding) delivers maximum memory utilization and
streamlined peripheral control
Internal Memory
– 16-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
– 4-KB single-cycle SRAM
General-Purpose Timers
– Three timers, each of which can be configured: as a single 32-bit timer, as two 16-bit
timers, or to initiate an ADC event
– 32-bit Timer modes:
• Programmable one-shot timer
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