P&E Microcomputer Systems XPC560S EVB User Manual - page 19
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xPC560S EVB User Manual
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Selects whether the I/O pins are pulled logic high or pulled logic low. This
controls the defaultlogic level of the I/O pins when the buttons are not
pressed.
Figure 3-3: Buttons circuitry schematic
3.4
LIN
There are footprints for two LIN connections on the xPC56XXMB. By default,
one LIN circuit is assembled (LIN1) and the other circuit is left unpopulated
Jumper Setting
Effect
1+2 (default)
I/O pins connected to the buttons are pulled up to
logic high
2+3
I/O pins connected to the buttons are pulled down to
logic low