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Full-Speed USB communication.","5V Header Pin: External 5V input rail feeding the onboard LDO regulator. Warning: Do not connect external 5V simultaneously with USB.","3.3V Header Pins: Regulated 3.3V system power output from the onboard LDO, or direct 3.3V power input if external 5V\u002FUSB is omitted.","VBAT Pin: Dedicated battery backup supply pin (1.8V to 3.6V) powering the Real-Time Clock (RTC) and 42 16-bit backup registers when main VDD is removed.",{"r10":1262,"flash128k":1263,"clones":1264},"USB Pull-Up Resistor (R10): Many cheap clone boards feature an incorrect 4.7kΩ or 10kΩ pull-up on D+ (PA12) instead of 1.5kΩ, preventing host USB enumeration.","Hidden 128 KB Flash: Genuine STM32F103C8 chips frequently contain 128 KB of working Flash memory instead of the official 64 KB rating.","Silicon Clones (CS32, CKS32, GD32): Numerous clone manufacturers produce pin-compatible variants that may have differing PLL configurations or USB bootloader timings.",{"tolerance5v":1266,"bootJumpers":1267,"pc13Led":1268,"jtagRemap":1269},"Selective 5V Tolerance: Only designated digital pins are 5V-tolerant (FT). All analog ADC input pins (PA0-PA7, PB0, PB1) and PC13-PC15 are strictly 3.3V maximum.","BOOT Configuration Jumpers: For standard user Flash execution, both BOOT0 and BOOT1 must be set to 0. Set BOOT0=1 to enter the built-in UART system bootloader.","Active-Low User LED: The onboard user LED on PC13 is wired to 3.3V through a current-limiting resistor. Driving PC13 LOW turns the LED ON; driving HIGH turns it OFF.","JTAG Pin Remapping: Pins PB3, PB4, and PA15 default to JTAG debug signals. To use them as general-purpose GPIOs, JTAG must be disabled via software remapping.","STM32F103C8T6 Blue Pill Pinout & Reference","This 44-pin STM32F103C8T6 Blue Pill explorer links the physical DIP-40 headers and SWD port to a searchable table. Select any pad or row to see its GPIO, 5V-tolerance status, peripheral roles, and hardware advisories.","Interactive STM32F103C8T6 Blue Pill pinout diagram: 40-pin DIP headers, 4-pin SWD debug port, 5V tolerance indicators, ADC channels, PWM timers, I2C, SPI, UART, CAN, USB, and R10 pull-up fix.","Popular 32-bit ARM Cortex-M3 microcontroller board running at 72 MHz with 64 KB Flash and 20 KB SRAM in a DIP-40 form factor.","Use the pin table to distinguish 5 V-tolerant digital pins from pins limited to the 3.3 V domain.","ADC-capable inputs are limited to the analog supply domain and must not be treated as 5 V-tolerant inputs.","The board exposes multiple UART, SPI, I2C, USB, CAN, timer, and SWD\u002FJTAG signals through alternate pin functions.","BOOT0 and BOOT1 select the startup memory mode; use the normal documented jumper state for user flash execution.","GPIO direction and 5 V tolerance vary by pin; consult the interactive table before wiring.",1791667433487]