Based on STM32F103CBT6 chip (Datasheet):
- Cortex-M3 72 Mhz
- 128 KB Flash
- 20 KB RAM
- Full-speed USB 2.0 device controller: up to 8 bi-directional endpoints including EP0 (*)
- UFQFPN48 packaging
(*) "Configurable number of endpoints from 1 to 8", "up to 16 mono-directional or 8 bidirectional endpoints can be used". (source: RM0008)
| Region | Size | Start | End |
|---|---|---|---|
| Flash | 128 KB | 0x0800_0000 | 0x0802_0000 |
| SRAM | 20 KB | 0x2000_0000 | 0x2000_5000 |
Bootloader size is 48 KB
| Signal | I/O | Symbol | Pin |
|---|---|---|---|
| SWD / JTAG | |||
| SWCLK / TCK | O | PB13 | 26 |
| SWDIO / TMS | O | PB14 | 27 |
| SWDIO / TMS | I | PB12 | 25 |
| SWO / TDO | I | PA10 | 31 |
| nRESET | O | PB0 | 18 |
| UART | |||
| UART RX | I | PA2 | 12 |
| UART TX | O | PA3 | 13 |
| Button | |||
| NF-RST But. | I | PB15 | 28 |
| LEDs | |||
| Connect. LED | O | PB6 | 42 |
| HID LED | O | PA9 | 30 |
| CDC LED | O | PA9 | 30 |
| MSC LED | O | PA9 | 30 |