Instruction Set
The ColdFire instruction set is "assembly source" compatible (by means of translation software available from the vendor) and not entirely object code compatible with the 68000. When compared to classic 68k hardware, the instruction set differs mainly in that it no longer has support for the binary-coded decimal (BCD) packed data format; it removes a number of other, less used instructions; and most instructions that are kept support fewer addressing modes. Also, floating point intermediates are 64 bits and not 80 bits as in the 68881 and 68882 coprocessors. The instructions are only 16, 32, or 48 bits long, a simplification compared to the 68000 series.
Read more about this topic: Freescale ColdFire
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