I've recently trawled through some old files from where I used to work and come across the documentation for the Microtec Research C compiler suite of tools that I used to use. I scanned these all in when our office got a new huge office printer that had double sided scanning and OCR capability.
I've now uploaded all the documentation I had to the Internet Archive for others to use. If I've got my link correct, then you can view them at:
https://archive.org/details/@markd833 or just search for MCC68K and ASM68K.
The documentation is for version 4.2 or 4.3K of the suite but does not include any documentation for the Xray debugger as I didn't have it in my suite.
I've also got the MS-DOS files for v4.3K of the suite and I think v4.5R (which I think includes the xray debugger). I hope to try and upload them to the archive shortly.