This handbook describes the STM32F103xC, STM32F103xD and STM32F103xE high‑density performance line microcontrollers. It includes a device overview, core specifications, memory options, pin‑out diagrams, and detailed electrical characteristics.
The document also covers power‑supply options, low‑power modes, timer and watchdog features, and the full set of communication interfaces such as USART, SPI, CAN, USB and SDIO, together with package data and ordering information.
| CPU core | ARM Cortex‑M3 |
|---|---|
| Maximum CPU frequency | 72 MHz |
| Flash memory | 256 KB to 512 KB |
| SRAM | up to 64 KB |
| DAC channels | 2 × 12‑bit |
| I/O ports | up to 112 fast I/O ports |
| USART interfaces | up to 5 |
| SPI interfaces | up to 3 |
| CAN interface | 2.0B Active |
| USB interface | USB 2.0 full speed |
| Timers | up to four 16‑bit timers + 2 motor‑control PWM timers |
| Operating voltage | 2.0 V to 3.6 V |
The core can run up to 72 MHz.
It operates from 2.0 V to 3.6 V.