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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You can write this either with or without the parentheses, and most assemblers can take either one. I will refer to this as “declaring” the label.
Copies whole A1 to D0. Take care with this!!! This may change the size of the label, in which case a third pass will be needed, and so on. The 68K instruction set is very orthogonal.
The assembler handles labels as aliases for numbers. Copies the long word starting at address location stored in A0 you say A0 points to the long word. First decreases A0 with 4 size of operandthen copies the long word starting at address stored in A0 to D2. In other languages Add links. All syntaxes are equivalent, but some assemblers won’t take them all. When moving a byte or a word, the upper part of the register will remain unchanged. A Wikibookian believes this page should be split into smaller pages with a narrower subtopic.
Their assembly languages are completely different. They are usually assembbleur in Jcc or Bcc instructions. The register looks like this:. W easier to read. CCR is just the flags. Wherever you see “cc” in an instruction, you should replace it with the appropriate conditional test code.
Scale can be 1, 2, 4, or 8. From Wikibooks, open books for an open world.
Ifs, Loops and the DBRA instruction
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. This document contains information on how to program the Motorola 68K-series microprocessors in assembly language.
On theonly the lower 24 bits output to any pins, giving a maximum addressing assemlbeur of 16MiB.
Only the lower byte is accessible in user mode, and of this, only the first five bits are useful. All listed syntaxes are equivalent, but some assemblers won’t accept them all.
This bit is always clear on processor models lower than assejbleur Other than that, I don’t know how this works. Usually, it just uses a known safe value like the current PCflags the location, and makes a second pass to substitute the real value. Like PC with displacement, but another register is added as well. Operate on the location pointed to by xxx. One thing to note is that the PowerPC is not binary compatible with the 68K processor.
Not all assemblers will take all listed syntaxes.
Like absolute near, you can include the parentheses at your discretion. Copies the contents of D1 to D0. When the instruction is executed, both registers will contain the same information. Normally the processor is in user mode. The 68K includes special addressing modes that make it assenbleur to manipulate a data stack structure using any address register.
IFs, LOOPs and DBRA
After the instruction, both registers contain the same information. If set, trace is allowed on any instruction. This is known as forward referencingand is handled differently depending on the assembler.