2.6 Default Jumper Settings
The following picture shows the default jumper settings. Jumpers in blue are in open position, jumpers in red are in closed position.
Boards are delivered in a factory configuration that may not correspond to a customer-specific use case. Before using the board, double check the jumpers settings against the view and table given below.
| Jumper | State | Function |
|---|---|---|
| J2 | Closed | VDDBU current measurement |
| J3 | Open (default) | RMII Ethernet interface is selected. |
| Closed | The 4-microphone PDMIC interface is selected. | |
| J22 | Open (default) | Booting from on-board memory is permanently allowed and only disabled during SW4 pressure. |
| Closed | Booting from on-board memory is permanently disabled. | |
| J25 | Open (default) | Enables UART communication (CDC) between MPU and SAM3U. |
| Closed | Disables UART communication (CDC) between MPU and SAM3U. | |
| J26 | Open (default) | The on-board J-Link interface is enabled and used for MPU debugging. |
| Closed | The on-board J-Link interface is disabled. MPU debugging is done through the JTAG connector (J27). |