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 only instructions that are allowed to use this addressing mode are: First decreases A0 with 4 size of operandthen copies the long word starting at address stored in A0 to D2. You can have as many labels xssembleur you want. Same as indirect addressing, but An will be increased by the size of the operation after the instruction is executed.

Like PC with displacement, but another register is added as well. Retrieved from ” https: These are typically used as pointers. By using this site, you agree to the Terms of Use and Privacy Policy.

Typically, there are only assembleuur few places you’ll want to refer to, for example the starting points of functions, loop starts and loop ends, and certain data storage locations. Views Read Edit View history.


All listed syntaxes are equivalent, but some assemblers won’t accept them all. Their assembly languages are completely different. Detailed descriptions of every instruction in the MC family can be found in the Programmer’s Reference Manual. Same as above, but another register will also be added. 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.

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

When it encounters one, it assigns it the current value of the assembler’s PC. This may change the size of the label, in which case a third pass will be needed, and so on. You can help by splitting this big page into smaller ones. These are intended to hold numbers that will have various mathematical and logical operations performed on them. If you refer to a word or a long word, the address in the address register must be an EVEN number. The assembler you use may have different behavior.

Policies and guidelines Contact us. After the instruction, both registers contain the same information. If it wasn’t so, a negative number would become positive.

On theonly the lower 24 bits output to any pins, giving a maximum addressing range of 16MiB.

A Wikibookian believes this page should be split into smaller pages with a narrower subtopic. Copies the contents of D1 to D0.


This bit is always clear on processor models lower than See Asse,bleur Links below.

68000 Assembly

Which you choose is largely a matter of personal preference, but most people find xxx. Refer to this table aesembleur what each test does. There are eight data registers: Some assemblers won’t take certain syntaxes.

Note that you can reference labels before they’re actually declared. Please make sure to follow the naming policy. Not supported by all devices. SR is the entire status register, including the system byte.

Only the lower byte is accessible in user mode, and of this, only the first five bits are useful. 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. You can write this either with or without the parentheses, and most assemblers can take either one. Not all assemblers will take all listed syntaxes.

Operate on the location pointed to by xxx. Most instructions can operate on all data sizes, and very few are restricted to less than three addressing modes.