ST STM32L4x6 - Figure 19. Input Floating;Pull Up;Pull down Configurations; Output Configuration

General-purpose I/Os (GPIO) RM0351
260/1693 DocID024597 Rev 3
Figure 19. Input floating/pull up/pull down configurations
7.3.10 Output configuration
When the I/O port is programmed as output:
• The output buffer is enabled:
– Open drain mode: A “0” in the Output register activates the N-MOS whereas a “1”
in the Output register leaves the port in Hi-Z (the P-MOS is never activated)
– Push-pull mode: A “0” in the Output register activates the N-MOS whereas a “1” in
the Output register activates the P-MOS
• The Schmitt trigger input is activated
• The pull-up and pull-down resistors are activated depending on the value in the
GPIOx_PUPDR register
• The data present on the I/O pin are sampled into the input data register every AHB
clock cycle
• A read access to the input data register gets the I/O state
• A read access to the output data register gets the last written value
Figure 20 shows the output configuration of the I/O port bit.
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