The smallest package of the RT685, the 114-ball package (MIMXRT685SFAWBR) does not provide any pins for connecting an SD/MMC card. Therefore, the user manual UM11147 Rev 1.4 section 36.1 should not start with "uSDHC0 is available on all RT6xx devices".
Hi @jacobvecht
Thanks a lot for the suggestion.
I will request our document improve the doc.
Thanks,
Jun Zhang