The only way I've found to stop a sector read that allows for the next command to be another sector read has been to either finish the original sector read or to initialize the MMC.
I know there's an ABORT sequence of some sort in there somewhere. I'll do some digging and get back to you...
when I use your ":" colon text editing to condense my I2C routines I get an error surrounding the "@ NOP" lines?
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