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

They are usually used in Jcc or Bcc instructions. Only the lower byte is accessible assemblekr user mode, and of this, only the first five bits are useful.

These are typically used as pointers. Their assembly languages are completely different. First decreases A0 with 4 size of operandassemblleur copies the long word starting at address stored in A0 to D2. Note that there is no postdecrement or preincrement addressing mode.

Not all assemblers will take all listed syntaxes.


Assembly – Wikibooks, open books for an open world

You can write this either with or without the parentheses, and most assemblers can take either one. See External Links below. Dividing books into smaller sections can provide more focus and allow each one to do one azsembleur well, which benefits everyone.

If set, look at M to determine what stack SP points to.

Other than that, I don’t know how this works. Please make sure to follow the naming policy. SR is the entire status register, 680000 the system byte. SR is only available in supervisor mode.

Ifs, Loops and the DBRA instruction

Wherever you see “cc” in an instruction, you should replace it with the appropriate conditional test code. The 68K instruction set is very orthogonal. These addressing modes perform two memory accesses – first a read in to a table of addresses, assembleut the actual read or write. You can ask for help in dividing this book in the assistance reading room. Some assemblers won’t take certain syntaxes.

68000 Assembly

When it encounters one, it assigns it the current value of the assembler’s PC. If set, trace is allowed on any instruction. Same as above, but another register will also be added. Views Read Edit View history. Copies the long word starting at address location stored in A0 you say A0 points sasembleur the long word.


This page was last edited on 26 Augustat The assembler you use may have different behavior. On theonly the lower 24 bits output to any pins, giving a maximum addressing range assemblehr 16MiB.


W easier to read. If it wasn’t so, a negative number would become positive. Take care with this!!! Most instructions can operate on all data sizes, and very few are restricted to 688000 than three addressing modes. The register looks like this:.

In supervisor mode, the entire bit register is accessible. Normally the processor is in user mode. These are intended to hold numbers that will have various mathematical and logical operations performed on them. Labels are simply names for lines.

Refer to this table for what each test does.