STM32F103RB Arm® 32-bit Cortex®-M3 CPU core – 72 MHz maximum frequency, 1.25 DMIPS/MHz (Dhrystone 2.1) performance at 0 wait state memory access – Single-cycle multiplication and hardware division

• Memories – 64 or 128 Kbytes of Flash memory – 20 Kbytes of SRAM

• Clock, reset and supply management – 2.0 to 3.6 V application supply and I/Os – POR, PDR, and programmable voltage detector (PVD) – 4 to 16 MHz crystal oscillator – Internal 8 MHz factory-trimmed RC – Internal 40 kHz RC – PLL for CPU clock – 32 kHz oscillator for RTC with calibration

• Low-power – Sleep, Stop and Standby modes – VBAT supply for RTC and backup registers

• 2x 12-bit, 1 µs A/D converters (up to 16 channels) – Conversion range: 0 to 3.6 V – Dual-sample and hold capability – Temperature sensor

• DMA – 7-channel DMA controller – Peripherals supported: timers, ADC, SPIs, I2Cs and USARTs

• Up to 80 fast I/O ports – 26/37/51/80 I/Os, all mappable on 16 external interrupt vectors and almost all 5 V-tolerant