SPI data minimum delay of two frames

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SPI data minimum delay of two frames

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文辉王
Contributor III

Hi,

I use the MPC5744P SPI module, because I have to make CPHA = 1, so I can not use continuous send mode. I want to know is, if I want to send 32-bit data, how to minimize the delay between two frames of data? What is the shortest delay time?

regards,

Vern

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PetrS
NXP TechSupport
NXP TechSupport

Hi,

tASC, tCSC and tDT specify the delay between words

 pastedImage_2.png

Those delays are configured by CTAR register

pastedImage_3.png

The shortest delay for each one is 2 protocol clocks (PBRIDGE_CLK), but I think you should use longer time.

BR, Petr

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文辉王
Contributor III

Hi,

Sorry, I was wrong. I need to use continuous mode with CPHA = 0, or to minimize the delay between two frames of data.

pastedImage_1.png

The figure above is mentioned in the manual, but I need to quickly transfer data when CPHA = 0. So I would like to know how to use continuous mode in this case or to minimize the delay between two frames of data.

regards,

Vern

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