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Figure 23.
Buttons schematics
Buttons connections to PORTA, PORTB, PORTC, PORTD and PORTE are shown
in Fig. 23. Jumper JP17 determines whether a button press will bring logical zero or
logical one to the appropriate pin.
When button is not pressed, pin state is determined by the pull-up or pull-down port
jumpers.
In the example shown in Fig. 23, JP17 is connected to +5V, therefore pressing the
buttons will bring logical one to the appropriate pins.
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