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New in NRF52 : SPI slave clock out Def as first byte on MISO

Hi, 

for my PCB, i'm using an NRF52832 as SPI slave, i send an array of 4 bytes {0xA5,0x00,0x01,ff},  but my SPI master receives always a byte (0xff) before 0xA5.

this ff byte corresponds to DEF byte, but i don't understand why its sent always before my frame ?! 

The SPI master clock freq = 4 MHz 

and i use the same main of sdk v11 spis example.

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