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TMS320C665x - Discontinuous Serial Clock

Bernhard Boehmer
Expert 1110 points

Hello TI,

Some ADCs with SPI bus data interface require or recommend the serial clock to be stopped during the conversion phase. Examples include Analog Devices AD7985 and Linear Technology LTC2323-16.

Paragraph 2.10 of spruhh0 (entitled "SPI Operation Using the Clock Stop Mode") asserts that the McBSP on Keystone 1 devices does not support the SPI protocol, but other than that I cannot find any mention of discontinuous clocking of the McBSP or SPI peripherals for the TMS320C665x in the spruhh0 and sprugp2a documents.

Would it be possible to confirm or deny whether direct interfacing to such devices as are mentioned above is possible for TMS320C665x using the McBSP or SPI ports?

  • 0
    TI__Mastermind 43660 points

    Hello Bernhard,

    Yes, the McBSP does not support SPI clock stop mode on keystone1 devices. So you cannot use McBSP to interface above mentioned devices.

    Instead, I think you could use SPIDELAY function to stop the clock in between. You can refer section 3.11 and appendix A in SPRUGP2A for more details.

    Regards,

    Senthil