Problem in SPI communication. Unable to generate required tdt wave.

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Problem in SPI communication. Unable to generate required tdt wave.

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ravitejaveeraga
Contributor II

I am working on MPC5777C controller.. In my project i have a slave device(SPI based) whose tdt timing is nearly 5usec. So i am using DT and PDT values in CTAR register to configure it. But what ever value i keep it is not at all changing and keep on giving 238nsec. That is equivalent to my one SPI clock period. Please help me to solve this.

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PetrS
NXP TechSupport
NXP TechSupport

Hi,

What is your SPI config in fact? Do you use Continuous Clock mode? Note in the Continuous Serial Communications Clock operation, the DT value is fixed to one SCK clock period.

BR, Petr

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ravitejaveeraga
Contributor II

Thank u Petr. It solves my problem..

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PetrS
NXP TechSupport
NXP TechSupport

Hi,

What is your SPI config in fact? Do you use Continuous Clock mode? Note in the Continuous Serial Communications Clock operation, the DT value is fixed to one SCK clock period.

BR, Petr

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