Evo 1-3 ECU Instruction Set

[AndyF]

Just what do all of those hex values actually mean :D

Andy

[AndyF]

Be aware though that there are a couple of Mitsubishi 'special' codes that they use that replace some of those given in the document above.

02 andm (Dir) - looks like an and-mask memory, like bset but with the bclr mask inverted
03 orm (Dir) - similar to above but an or-mask memory

Example:
02 FA FE - clears bit 1 of memory location 0xFA
03 FA 02 - sets bit 2 of memory location 0xFA

1C CPD (imm)
1D CPD (Dir)
1E CPD (Ind,X)
1F CPD (Ext)

These replace the std opcodes for 1C - 1E and are just compare D instructions

87 BRSET(Dir) - Branch if bit set instruction

8F BRCLR (Dir) - Branch if bit clear instruction

The 2 above are possibly branch if all bits are set and branch if all bits are clear rather than the usual branch if individual bits are set or clear.

Andy