STMicroelectronics STM32F100R8

The STMicroelectronics STM32F100R8 is an ARM 32-bit Cortex-M3 Microcontroller, 24MHz, 64kB Flash, 8kB SRAM, PLL, Embedded Internal RC 8MHz and 40kHz, Real-Time Clock, Power Saving Modes, JTAG and SWD, 7-channel DMA, Nested Interrupt Controller, 12-bit 16-ch A/D Converter, 2 12-bit 2-ch D/A converters, 51 Fast I/O Ports, 2 SPI, 2 I2C, 3 USART, CRC calculation unit, SysTick Timer, 2 Watchdog Timers, 16-bit 6-ch advanced timer with PWM, 6 16-bit Timers with Input Capture, Output Compare and PWM.