=> R0 = CRC continuation value, or 0
R1 = pointer to start of block
R2 = pointer to end of block
R3 = Increment
<= R0 = CRC value
Calculate the Cyclic-Redundancy Check for a block of data. The value calculated is only 16 bit.
Note: The SWI adds R3 to R1 until it equals R2, ie if R1 never equals R2 you have an infinite loop.
Note2: The byte at R2 is not included in the CRC value.
See PRM 1, page 942.
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