STM32F103C6T6 pin arrangement instructions

 The STM32F103C6T6 is a 48-pin microcontroller packaged in LQFP. Here is the detailed pin arrangement instructions:



Power Pins


  • VDD_4 and VSS_4: These are the digital power supply and ground pins respectively. They provide power and the reference ground for the digital components of the microcontroller.
  • VDDA and VSSA: These pins supply power and the ground reference for the analog components such as the ADC, oscillators, etc. within the microcontroller.
  • VBAT: This pin is connected to an external backup battery. It provides power to the RTC (Real-Time Clock) and backup registers when the main power supply is off, ensuring that the RTC continues to run and the backup data is retained.

Oscillator Pins


  • OSC_IN and OSC_OUT: These are the input and output pins for the main oscillator. Typically, an external crystal oscillator is connected between these two pins to provide the system clock source for the microcontroller. In some cases, these pins can also be remapped for other functions, such as CAN_RX and CAN_TX.
  • PC14-OSC32_IN and PC15-OSC32_OUT: These pins are used for connecting a 32.768 kHz external crystal oscillator, which is mainly used to provide a more accurate clock source for the RTC.

Reset Pin


  • NRST: The reset pin is used to reset the microcontroller. When this pin is pulled low, it resets the internal registers and peripherals of the microcontroller to their initial states.

GPIO Pins


  • PA0-WKUP: This pin has multiple functions. It can be used as a general-purpose input/output (GPIO) pin PA0. Additionally, it has the wake-up function (WKUP) to wake up the microcontroller from standby or sleep modes. It can also be configured as the CTS (Clear To Send) signal for USART2.
  • PA1: It can be used as GPIO PA1 or configured as RTS (Request To Send) for USART2 or as an analog input ADC123_IN1.
  • PA2: It serves as GPIO PA2, or can be configured as the transmit pin (TX) for USART2 or as TIM5_CH3 for timer functionality. It can also be used as ADC123_IN2 for analog input.
  • PA3: This pin can be GPIO PA3, the receive pin (RX) for USART2, TIM5_CH4 for timer use, or ADC123_IN3 for analog input.
  • PA4: It can be used as GPIO PA4, the Slave Select (NSS) signal for SPI1, or the clock signal (CK) for USART2. It can also function as DAC_OUT1 or ADC12_IN4.
  • PA5: This pin can be GPIO PA5, the Serial Clock (SCK) for SPI1, or DAC_OUT2. It can also be used as ADC12_IN5.
  • PA6: It can be GPIO PA6, the Master In Slave Out (MISO) signal for SPI1, or TIM8_BKIN for timer functionality. It can also be remapped to TIM1_BKIN and used as ADC12_IN6 or TIM3_CH1.
  • PA7: It can be GPIO PA7, the Master Out Slave In (MOSI) signal for SPI1, or TIM8_CH1N for timer use. It can also be remapped to TIM1_CH1N and used as ADC12_IN7 or TIM3_CH2.
  • PB0: This pin can be GPIO PB0, ADC12_IN8 or TIM3_CH3. It can also be remapped to TIM1_CH2N.
  • PB1: It can be GPIO PB1, ADC12_IN9 or TIM3_CH4. It can also be remapped to TIM1_CH3N.
  • PC0: It can be used as GPIO PC0 or as ADC123_IN10 for analog input.
  • PC1: It can be GPIO PC1 or ADC123_IN11 for analog input.
  • PC2: It can be GPIO PC2 or ADC123_IN12 for analog input.
  • PC3: It can be GPIO PC3 or ADC123_IN13 for analog input.
  • PC4: It can be GPIO PC4 or ADC12_IN14 for analog input.
  • PC5: It can be GPIO PC5 or ADC12_IN15 for analog input.

Other Special Function Pins


  • PC13-TAMPER-RTC: This pin has multiple functions related to tamper detection and the RTC. It can be used as a general-purpose I/O pin PC13. It is also connected to the tamper detection circuit and can be used to monitor if there is an unauthorized access or tampering attempt on the device. Additionally, it is related to the RTC functionality.
  • JTMS/SWDIO (PA13) and JTCK/SWCLK (PA14): These pins are used for Serial Wire Debug (SWD) communication, which is a two-wire debug interface for programming and debugging the microcontroller. JTMS (Joint Test Action Group - Test Mode Select) is also known as SWDIO (Serial Wire Debug Input/Output), and JTCK (Joint Test Action Group - Test Clock) is also known as SWCLK (Serial Wire Debug Clock).

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