Problem with 32 bit SPI communication in MPC5748G

[krishnaduriseti]

Hello Team,

I am trying to use 32 bit SPI frames for my SPI slave device and i use MPC5748G MCU. And I tried to use Extended SPI mode with CONT PCS to be able to use 32 bit frames directly, But I see there is a glitch in the clock signal and  MOSI after 16 clocks because of this my SPI slave transmit status as SPI error.

I have attached the Logic analyzer capture for your refernce.

I tried enabling continuous clock but doesn't help. Any idea what is the problem here. Please let me know if you need more information.

Thank you in advance!!

Regards,

Krishna duriseti

[krishnaduriseti]

Hello David,

Thanks for quick response. after tuning tASC delay slave responds properly.

Thank you again for your support.

Regards, 

Krishna duriseti.

[davidtosenovjan · Accepted solution]

If I understand it well, this mode acts as concatenated 16-bit transfers, So it is needed to properly setup tASC time. Try to lengthen it and I believe, the glitch disappears.