Pin Functions | PINSEL | Pin function selection | Pin Multiplexing | Pin function Control
Pin function selection (pin multiplexing) allows microcontrollers to assign multiple, alternative purposes (GPIO, UART, ADC, PWM) to a single physical pin, optimizing space. It is managed via specialized registers (e.g., PINSEL in ARM, GPIOAFSEL in TM4C) or software tools (e.g., IDE Configurator) to configure bits that map the desired function, usually defaulting to GPIO.
Multiplexing Mechanism: Since multiple peripherals connect to one pin, only one function can be active at a time.
Configuration: Typically involves setting 2 bits per pin in a register to select from 4 possible modes (00, 01, 10, 11).
Common Functions:
GPIO: General Purpose Input/Output (default).
Peripherals: UART (TX/RX), SPI (MOSI/MISO/SCK), I2C (SDA/SCL), PWM.
Analog: Analog-to-Digital Converter (ADC) input or Digital-to-Analog Converter (DAC) output.
Tools: Manufacturers provide graphical tools (e.g., Keil, STM32CubeMX, RZ/T FSP) to visualize pin mapping and prevent conflicts.
Important Constraints: Avoid assigning the same peripheral signal to multiple pins, and check data sheets for specific pin, voltage, and electrical characteristics.
What you will learn in this video:
What is Pin Function Selection?
Difference between GPIO and alternate functions
How to configure pins using registers (PINSEL, GPIO, etc.)
Pin multiplexing explained with LPC1768 / ARM Cortex-M example
Coding examples in Embedded C
If you have any questions, please write to us
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Timestamps:
00:00 Introduction
00:34 Pin Function Selection
04:25 Pin Function Description
10:00 Pin Function Configuration in the software
12:24 Analysing Pin Functions in the debugger
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