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GPIO Functional Description
SUB-20 GPIO can be in input or output state. GPIO state is defined by configuration bit. In output state GPIO will drive high or low level depending on output status. In input state GPIO can be pulled high by internal weak pull-up resistor.
GPIO Pin configuration
GPIOB are located on SPI header (see SPI Header). GPIOB module shares I/O pins with SPI module. If SPI is enabled MISO,MOSI,SCK and SS0 pins are partially controlled by SPI module, although they can be accessed by GPIOB functions with restrictions.
Special care should be taken for SUB-Lxxx models where SPI Level Converters are installed. In this case GPIOB pins direction should respect direction of the corresponding Level Converter to prevent short circuit on this pins.