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STM8S105K4T6C Detailed explanation of pin function specifications and circuit principle instructions

The STM8S105K4T6C is a microcontroller from STMicroelectronics, part of the STM8 family. This specific model, STM8S105K4T6C, is a member of the STM8S series, which is known for offering 8-bit performance with a low- Power consumption design, suitable for various embedded systems.

This microcontroller is typically available in a LQFP-32 (Low-profile Quad Flat Package) configuration, meaning it has 32 pins. Below is a detailed explanation of the pin functions and specifications, including the pinout of the STM8S105K4T6C microcontroller.

Package Type

Package Type: LQFP-32 (Low-profile Quad Flat Package) Pin Count: 32 Pins

Pin Function List

Here’s the detailed explanation of each pin on the STM8S105K4T6C microcontroller. The functions of the pins are as follows:

Pin Number Pin Name Pin Function/Description 1 VSS Ground pin. Connect to system ground. 2 PA0 General-purpose input/output (GPIO), analog input (ADC). 3 PA1 General-purpose input/output (GPIO), analog input (ADC). 4 PA2 General-purpose input/output (GPIO), analog input (ADC). 5 PA3 General-purpose input/output (GPIO), analog input (ADC), UART TX. 6 PA4 General-purpose input/output (GPIO), SPI MISO (Master In Slave Out). 7 PA5 General-purpose input/output (GPIO), SPI MOSI (Master Out Slave In). 8 PA6 General-purpose input/output (GPIO), SPI SCK (Serial Clock ). 9 PA7 General-purpose input/output (GPIO), SPI CS (Chip Select). 10 PB0 General-purpose input/output (GPIO), interrupt function, PWM. 11 PB1 General-purpose input/output (GPIO), interrupt function, PWM. 12 PB2 General-purpose input/output (GPIO), I2C SCL (Serial Clock). 13 PB3 General-purpose input/output (GPIO), I2C SDA (Serial Data). 14 PB4 General-purpose input/output (GPIO), PWM, Timer output. 15 PB5 General-purpose input/output (GPIO), PWM, Timer output. 16 PB6 General-purpose input/output (GPIO), Timer input/output. 17 PB7 General-purpose input/output (GPIO), Timer input/output. 18 PC0 General-purpose input/output (GPIO), external interrupt. 19 PC1 General-purpose input/output (GPIO), external interrupt. 20 PC2 General-purpose input/output (GPIO), external interrupt. 21 PC3 General-purpose input/output (GPIO), external interrupt. 22 PC4 General-purpose input/output (GPIO), external interrupt. 23 PC5 General-purpose input/output (GPIO), external interrupt. 24 PC6 General-purpose input/output (GPIO), external interrupt. 25 PC7 General-purpose input/output (GPIO), external interrupt. 26 VDD Power supply pin. Connect to system positive supply voltage. 27 Reset Reset pin. Low-level triggers a system reset. 28 BOOT0 Bootloader selection pin. Used to select boot mode (Normal or Bootloader). 29 NRST Reset pin, same as the Reset pin (usually on some configurations). 30 VSS Ground pin. Connect to system ground. 31 VBAT Battery backup pin. Used for RTC (Real-Time Clock) backup power. 32 SWDIO Serial Wire Debug Data Input/Output pin. For debugging and programming.

FAQ on STM8S105K4T6C Pin Functions

Q: What is the main use of PA0 to PA3 pins? A: These are general-purpose input/output (GPIO) pins, and they can also function as analog inputs for the ADC (Analog-to-Digital Converter). Q: Can I use PA5 for PWM output? A: Yes, PA5 can function as a PWM output pin, and it can also serve as the SPI MOSI (Master Out Slave In) pin. Q: What function does PB3 have? A: PB3 functions as the I2C SDA (Serial Data) pin, and it can also serve as a general-purpose GPIO. Q: How do I use the UART communication on STM8S105K4T6C? A: The UART TX (transmit) pin is PA3. You can use this pin for serial communication by configuring the microcontroller appropriately. Q: What is the purpose of the Reset pin (Pin 27)? A: The Reset pin is used to restart the microcontroller when a low-level signal is applied. Q: Can the STM8S105K4T6C support external interrupts? A: Yes, the microcontroller supports external interrupts through several pins, including PA0, PB0, and PC0 to PC7. Q: Is there a pin for debugging on this microcontroller? A: Yes, the SWDIO pin is used for debugging and programming via Serial Wire Debug (SWD). Q: Can I power the microcontroller through the VDD pin? A: Yes, VDD is the power supply pin for STM8S105K4T6C. It should be connected to the system’s positive supply voltage. Q: How is the I2C communication handled on this chip? A: The I2C communication is handled using PB2 for SCL (Clock) and PB3 for SDA (Data).

Q: What are the possible modes for the BOOT0 pin?

A: The BOOT0 pin is used to select the boot mode. It determines whether the microcontroller will start in normal mode or enter the bootloader for programming.

Q: What is the role of the VBAT pin?

A: The VBAT pin provides backup power for the Real-Time Clock (RTC) to continue functioning when the main power is turned off.

Q: What is the function of the PA7 pin?

A: PA7 can serve as a GPIO, and it also acts as an SPI chip select (CS) pin for communication with external peripherals.

Q: Can I use PA6 as a clock signal?

A: Yes, PA6 can be used as the SPI SCK (Serial Clock) signal for communication.

Q: How many pins on the STM8S105K4T6C can function as external interrupts?

A: The microcontroller supports external interrupts on all PC pins (PC0-PC7), PA0, and PB0.

Q: How does the STM8S105K4T6C handle analog input?

A: The PA0 to PA3 pins function as analog inputs for the ADC, allowing you to read analog signals and convert them to digital values.

Q: What are the limitations of the GPIO pins?

A: GPIO pins on STM8S105K4T6C can be configured for multiple functions, but they might be limited in terms of current output (max 20mA per pin).

Q: Is there a specific pin for power management?

A: Yes, the VSS and VDD pins handle the power supply connections, and the VBAT pin is used for backup power to the RTC.

Q: How is PWM controlled on STM8S105K4T6C?

A: PWM can be generated using PB4, PB5, and other timer-controlled GPIOs.

Q: Can I connect a battery directly to the VBAT pin?

A: Yes, the VBAT pin is designed to connect a backup battery to maintain the RTC operation.

Q: Does the STM8S105K4T6C support SPI?

A: Yes, the microcontroller supports SPI communication through pins PA4 (MISO), PA5 (MOSI), PA6 (SCK), and PA7 (CS).

This description covers all 32 pins of the STM8S105K4T6C and their respective functions, while providing useful answers to common questions regarding the pin functionalities. If you need further assistance, feel free to ask!