I am using the spi slave example code from SDK 0.9.2 and connect the board to an Atmel SAM4S who is the SPI master. I can see that every time the CS signal is released from the Atmel the nrf52 seems to reset. What could be the reason for that behavior? I'm connecting the SPI as follows:
SPI CS: P0-12
SPI SCL: P0-29
SPI MOSI: P0-25
SPI MISO: P0-28