A TI esta a fazer uma promoção de pré-lançamento para o Stellaris ARM 32 bits Cortex M4
Por apenas $4.99 momento é a board mais barata 32 bits que conheço.
(https://lusorobotica.com/proxy.php?request=http%3A%2F%2Fwww.ti.com%2Fww%2Fen%2Flaunchpad_site%2Fgraphics%2Fc2000_boosterpack.jpg&hash=814edb1fb2258d6abe5148f5f64e8bbeeb8a2aee)
Aqui fica o link:
http://www.ti.com/ww/en/launchpad_site/stellaris.html?DCMP=stellaris-launchpad&HQS=stellaris-launchpad (http://www.ti.com/ww/en/launchpad_site/stellaris.html?DCMP=stellaris-launchpad&HQS=stellaris-launchpad)
http://www.ti.com/product/lm4f120h5qr (http://www.ti.com/product/lm4f120h5qr)
excerpt below:
32-bit ARM® Cortex™-M4F 80-MHz processor core with System Timer
(SysTick), integrated Nested Vectored Interrupt Controller (NVIC),
Wake-Up Interrupt Controller (WIC) with clock gating, Memory
Protection Unit (MPU), IEEE754-compliant single-precision
Floating-Point Unit (FPU), Embedded Trace Macro and Trace Port, System
Control Block (SCB) and Thumb-2 instruction set