3. REva mother board
REva User Guide: Mother Board
3.7 Digital inputs area
This area provides the user with immediately usable digital I/Os that can be used as interrupt sources or
general purpose I/Os.
3.7.1 Features
●
1 two-position jumper to choose the polarity of the BT6 push button.
●
2 push buttons and 4 switches. When the switches are on or the buttons pressed, the corresponding
signal is tied to the ground (except for BT6 which depends on the chosen polarity). Otherwise, the
signals are floating.
●
6 jumpers enabling
the
independent use of each of these features. Use of a switch or a button is
enabled when the corresponding jumper is set.
3.7.2 Limitations
There are no debouncing filters connected to these buttons and switches. The user may use the wrapping
zone to add some, with the appropriate values for R and C.
When using buttons or switches, the corresponding pads of the microcontroller should be configured as
inputs, or I/Os with a pull-up resistor (or pull-down for BT6 with positive polarity), because there is no
external pull-up (pull-down).
Raisonance
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