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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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The register looks like this:. In other languages Add links. Scale is not supported on all devices. Wikipedia has more about this subject: Dividing books into smaller sections can provide more focus and allow each one to do one thing well, which benefits everyone. Some instructions only accept one or the other of near or far absolute addresses, thus the separation.

W easier to read. The Program Counter PC points to the current instruction. Wherever you see “cc” in an instruction, you should replace it with aszembleur appropriate conditional test code. You can have as many labels as you want. This page was last edited on 26 Augustat If it wasn’t so, a negative number would become positive.

Normally the processor is in user mode. All listed syntaxes are equivalent, but some assemblers won’t accept them all. When a word is transferred to an address register, bit 15 the sign bit will be copied through the whole upper word bit Like absolute near, you can include the parentheses at your discretion.


This document contains information on how to program the Motorola 68K-series microprocessors in assembly language.

Ifs, Loops and the DBRA instruction

Most instructions can operate on all data sizes, and assrmbleur few are restricted to less than three addressing modes. If set, trace is allowed on any instruction. This bit is always clear on processor models lower than Operate on the location pointed to by xxx.

Only the lower byte is accessible in user mode, and of this, only the first five bits are useful. Copies the long word starting at address location stored in A0 you say A0 points to the long word.

There is one active stack pointer: On theonly the lower 24 bits output to any pins, giving a maximum addressing range of 16MiB. Note that Assembleur is the address of the extension word that x is stored in right after the instruction’s word. This label can then be used as an operand anywhere a number can. Qssembleur Read Edit View history. By using this site, you agree to the Terms of Use and Privacy Policy.

The assembler handles labels as aliases for numbers. Determines which stack mode to use if S is set. If set, trace on change of program flow. There are eight data registers: They are usually used in Jcc or Bcc instructions.

When it encounters one, it assigns it the current value of the assembleud PC. In supervisor mode, the entire bit register is accessible. These are intended to hold numbers that will have various mathematical and logical operations performed on them. There are seven address registers: Like PC with displacement, but another register is added as well.


Which you choose is largely a matter of personal preference, but most people find xxx. Refer to this table for what each test sasembleur.

68000 Assembly

From Wikibooks, open books for an open assembler. Books to be broken into subpages Subject: The assembler you use may have different behavior. The only exception is byte operations on A7 – this register must point to an even address, so it will always increment by at least 2. Please make sure to follow the naming policy.

Assembly – Wikibooks, open books for an open world

Not all assemblers will take all listed syntaxes. Copies whole A1 to D0. Note that you can reference labels before they’re actually declared. The 68K instruction set is very orthogonal. The only instructions that are allowed to use this addressing mode are: When moving a byte or a word, the upper part of the register will remain unchanged. CCR is just the flags.