Hello Keith,
Could you please provide your full device number? Please notice that the K22 family is subdivided in multiple sub-families and each of them have their own reference manual. If you want to see the information about the registers SSRS0 and SSRS1 then you should see the following reference manual. But keep in mind that this reference manual only supports the sub-families that are mentioned in the cover.
To find the correct reference manual for your device, first you need to get your full device ID. Then in the documentation page you can see the supported parts of each reference manual.
Hope it helps!
Victor.
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