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User:Chromaryu/68KSnippet
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 | This article is a work in progress. ...Well, all the articles here are, in a way. But this one moreso, and the article may contain incomplete information and editor's notes. |
 | To do: Add more of these. |
68kSnippet is Chromaryu's subpage.
This page covers 68000 assembly instructions.
on this snippet,
- $FFFF0000 and below 64kB is considered as RAM region.
- Dx means any of Data Registers
- Ax means any of Address Registers
- Rx = Dx or Ax.
Registers
68000 have 8 data registers, 8 address registers; corresponding to d0-7, a0-7.
specially, a7 is considered as SP(Stack Pointer).
PC register is 24bit.
Addressing
there's l,w,b, corresponds to Longword, Word, Byte.
Longword means 32bit, word is 16bit, byte is 8bit.
addressing can be defined <Mnemonics>.<addressingMode>
Instruction set
Math instructions
| Mnemonics | Arguments | Attributes | Operation |
|---|---|---|---|
| ADD | Dn,Dn | Size(lwb) | Source+Dest->Dest |
| SUB | Dn,Dn | Size(lwb) | Dest-Source->Dest |
| SWAP | Dn | Size(w) | Reg[31:16] <-> Reg [15:0] |
| EXG | Rx,Rx | Size(l) | Rx[0] <-> Rx[1] |
| CLR | Rx | Size(lwb) | 0->Dest |
