3.1.1 Default Jumper Settings
The figure below shows the default jumper settings. Jumpers in red are configuration items and current measurement points. The following table describes the functionality of the jumpers.
| Jumper | Default | Function |
|---|---|---|
| J1 | Closed | VDD_MAIN_5V current measurement |
| J2 | Closed | VDD_3V3 SOM current measurement |
| J4 | Closed | VDDBU current measurement |
| J7 | Open | Enables J-Link-OB (closed=disable) |
| J8 | Open | Erases
SAM3U firmware code (closed=erase at power-up) Warning: Must remain open. If closed,
the SAM3U contents are erased and J-Link functionality is discarded.
|
| J9 | Open | Enables JTAG-CDC (closed=disable) |
| J13 | Open | Disables SOM boot memories (closed=disable) |
| J22 | Closed | Enables 3.3V power mikroBUS1 (closed=enable) |
| J28 | Closed | Enables 3.3V power mikroBUS2 (closed=enable) |