User's Manual

Silicon Laboratories Finland Oy
Page 27 of 45
8 Serial Peripheral Interface (SPI)
The SPI port can be used for system debugging. It can also be used for programming the Flash memory and
setting the PSKEY configurations. WT41u uses 16-bit data and 16-bit address serial peripheral interface, where
transactions may occur when the internal processor is running or is stopped. SPI interface is connected using
the MOSI, MISO, CSB and CLK pins. Please, contact the Silicon Labs support at http://www.silabs.com for
detailed information about the instruction cycle.