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Kinetis SPI at bus clock / 2 not working

Question asked by Peter Liedholm on Feb 28, 2013
Latest reply on Mar 22, 2013 by alejandrolozano

Hi

 

I am running a K60F120 with a bus clock of 60 MHz. Reference manual ch 3.9.5.2 clearly states that bus clock / 2 is max speed of SPI bus.

 

The test confirms that the SPI CLK signal is operating at 30 MHz. Thats as expected. But the MISO signal is not perceived correctly by my K60 (master). It seems that the bits are shifted so the physical MSB (first) is received as next bit.

 

Verification method is by oscilloscope 2 GHz with 1 GHz probes. Curveform looks quite OK.

 

Is SPI rate = bus clock / 2 really working?

 

/Peter

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