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What is a LPSPI framesize of 33 bits (or similar)?

Question asked by Stefan Mitterhauser on Feb 17, 2020
Latest reply on Feb 18, 2020 by Stefan Mitterhauser

Hello,

 

in RT1020 Reference Manual Table 42-3 LPSPI Command Word in Master Mode (continued) is the following entry for FRAMESZ:

Does the above mean if I my frame size is more than one FIFO entry the last FIFO entry should include at least 2 bits of the frame size?

 

e.g. 32 bits are okay ( = 1 FIFO entry)

       33 bits are not okay (= 2 FIFO entries, the second one would only include 1 bit)

       64 bits are okay (= 2 FIFO entries)

       65 bits are not okay because it would be 2 FIFO entries with 32 bit each and one FIFO entry with 1 bit

 

Therefore similar frame sizes to 33 bits would be 65 bits, 97 bits, 129 bits, ... Is this correct?

 

Kind regards,

Stefan

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