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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One thing to note is that the PowerPC is not binary compatible with the 68K processor.

Views Read Edit View history. When moving a byte or a word, the upper part of the register will remain unchanged. This bit is always clear on processor models lower than Like PC with displacement, but another register is assembldur as well. If set, look at M to determine what stack SP points to.

Wikipedia has more about this subject: The assembler you use may have different behavior. Note that you can reference labels before they’re actually declared. CCR is just the flags. The only instructions that are allowed to use this addressing mode are: A Wikibookian believes this page should be split into smaller pages with a narrower subtopic. Only the lower byte is accessible in user mode, and of this, only the first five bits are useful.


Detailed descriptions of every instruction in the MC family can be found in the Programmer’s Reference Manual. Refer to this table for what each test does. Not supported by all devices.

Please make sure to follow the naming policy. W easier to read. Copies whole A1 to D0. These are intended to hold numbers that will have various mathematical and logical operations performed on them. Normally the processor is in user mode. Same asaembleur indirect addressing, but An will be increased by the size of the operation after the instruction is executed.

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

Note that PC is the address of the extension word that x is stored in right after the instruction’s word. On theonly the lower 24 bits output to any pins, giving a maximum addressing range of 16MiB. Determines assemnleur stack mode to use if S is set. Labels are simply names for lines. You can ask for help in dividing this book in the assistance reading room.

68000 Assembly

Like absolute near, you can include the parentheses at your discretion. When the instruction is executed, both registers will contain the same assemb,eur. This may change the size of the label, in which case a third pass will be needed, and so on.

You can have as many labels as you want.


Copies the long word starting at address location stored in A0 you say A0 points to assemnleur long word. The 68K includes special addressing modes that make it easy to manipulate a data stack structure using any address register.

After the instruction, both registers contain the same information. Their assembly languages are completely different. This page was last edited on 26 Augustat If it wasn’t so, a negative assembldur would become positive.

See External Links below. When it encounters one, it assigns it the current value of the assembler’s PC. These addressing modes perform two memory accesses – first a read in to a table of addresses, second the actual read or write. There is one active stack pointer: They are usually used in Jcc or Bcc instructions. This is known as forward referencingand is handled differently depending on the assembler.

This document contains information on how to program the Motorola 68K-series microprocessors in assembly language. This label can then be used as an operand anywhere a number can. Some instructions only accept one or aesembleur other of near or far absolute addresses, thus the separation.