When does the FlexIO shifter read data from input pin

Fanta — Thu, 19 Jun 2025 02:49:43 GMT

Hi,

I'm learning to use FlexIO in S32K3. I set the shifter in receive mode and the shift occurs on the positive edge. About the function of shifter, I wonder which description below is correct.

1) When there is a positive edge, the shifter reads one bit data from the input pin first, and then the shift occurs.

2)The shift occurs first, and then the shifter reads one bit data from the input pin.

Thanks

Re: When does the FlexIO shifter read data from input pin

danielmartynek — Thu, 19 Jun 2025 07:36:58 GMT

Hi @Fanta,

When the shifter is configured to shift on a positive edge, the sampling and shifting are effectively synchronized with that edge. So, at the moment of the positive edge, the shifter samples the input pin and shifts the sampled bit into the shift register.

Regards,

Daniel

topic When does the FlexIO shifter read data from input pin in S32K

When does the FlexIO shifter read data from input pin

Re: When does the FlexIO shifter read data from input pin