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.
Table 1. Signals Pin Description
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:
  1. 1.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.