The Stellaris® LM3S300 microcontroller is based on the ARM® Cortex™-M3 controller core operating at 25 MHz, with 16 kB single-cycle flash, 4 kB single-cycle SRAM, a 24-bit Systick Timer, 3x 32-bit or 6x 16-bit general-purpose timers, a watchdog timer, a SSI / SPI controller, an I2C interface, 2 UARTs, 3 analog comparators, a low drop-out voltage regulator, brown-out reset, power-on reset controller, and up to 36 GPIOs.