a)HLL b) 68K x:=x+1 ADDQ.W #1,X IF A=7 THEN CMPI.W #7,A B:=3; BNE NEXT C:=4; MOVEQ #3,B END IF MOVEQ #4,C x:=X+2; NEXT: ADDQ.W #2,X b) At. Programmation Structurée En Assembleur by J.-P. Malengé, S. Albertsen, P. Collard and L. Andréani Masson, Paris, pages. ABCD. Operation: Source(base 10) + Destination (base 10) –>; Destination. Compatibility: Family. Assembler Syntax: ABCD Dy, Dx ABCD -(Ay), -(Ax).

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They are usually used in Jcc or Bcc instructions. Like PC with displacement, but another register is added as well. Usually, it just uses a known 68000 value like the current PCflags the location, and makes a second pass to substitute the real value. Only the lower byte is accessible in user mode, and of this, only the first five bits are useful.

Langage de programmation – Assembleur – Référence d’instructions Motorola x0 par OpCode

SP, also called a7. These are intended to hold numbers that will have various mathematical and logical operations performed on them.

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If set, trace on change of program flow. You can ask for help in dividing this book in the assistance reading room. Wikipedia has more about this subject:.

If you refer to a word or a long word, the address in the address register must be an EVEN number. Note that there is no postdecrement or preincrement addressing mode. The 68K includes special addressing modes that make it easy to manipulate a data stack structure using any address register. In other languages Add links. Labels are simply names for lines.


A Wikibookian believes this page should be split into smaller pages with a narrower subtopic. Most instructions can operate on all data sizes, and very few are restricted to less than three addressing modes.

When the instruction is executed, both registers will contain the same information. By using this site, you assenbleur to the Terms of Use and Privacy Policy. Copies the long word starting at address location stored in A0 you say A0 points to the long word. Please make sure to follow the naming policy. You can have as many labels as you want. One thing to note is that the PowerPC is not binary compatible with the 68K processor.

All syntaxes are equivalent, but some assemblers won’t take them all. You can write this either with or without the parentheses, and most assemblers can take either one. SR is only available in supervisor mode. If set, trace is allowed on any instruction. Scale can be 1, 2, 4, or 8. From Wikibooks, open books for an open world. Views Read Edit View history.

When a word is 68000 to an address register, bit 15 the sign bit will be copied through the whole upper word bit Detailed descriptions of every instruction in the MC family can be found in the Programmer’s Reference Manual. Dividing books into smaller sections can provide more focus and allow each one to do one thing well, which benefits everyone.


The only exception is byte operations on A7 – this register must point to an even address, so it will always decrement by at least 2.

68000 Assembly

The 68K instruction set is very orthogonal. Books to be broken into subpages Subject: Some assemblers won’t take certain syntaxes. This may change the size of the label, in which case a third pass will be needed, and so on. Their assembly languages are completely different. Some instructions only accept one or the other of near or far absolute addresses, thus the separation.

I will refer to this as “declaring” the label. After the instruction, both registers contain the same information. When moving a byte or a word, the upper part of the register will remain unchanged. When it encounters one, it assigns it the current value of the assembler’s PC. W easier to read. This page was last edited on 26 Augustat If it wasn’t so, a negative number would become positive.

All listed syntaxes are equivalent, but some assemblers won’t accept them all.