3.3.6 Serial Flash
WLR089 Xplained Pro Evaluation board contains a 4-Mb
serial Flash (AT25DF041B-SSHN-T) for Firmware Update Over-The-Air (FUOTA) and other
applications. The SPI signals are connected to SERCOM 5. SPI signals are also available
on EXT1, EXT3 and the embedded debugger.
| Pin on WLR089U0 Module | Function | Shared Functionality |
|---|---|---|
| PB22 | MOSI | EXT1, EXT3, EDBG |
| PA22(1) | CS | EXT1, EDBG |
| PB23 | SCK | EXT1, EXT3, EDBG |
| PB02 | MISO | EXT1, EXT3, EDBG |
Note:
- Ensure that a jumper cap is placed on the J306 header. Do not use the IRQ line at pin 9 in the EXT1 header while using serial Flash.