Motorola MVME2600 Series User Manual download pdf (Page 319)

100

101

One-Line Assembler/ Disassembler

4-9

The order of evaluation is strictly left to right with no precedence

granted to some operators over others. The only exception to this is

when you force the order of precedence through the use of

parenthesis.

The order of parsing algebraic expressions is:

OPERAND OPERATOR OPERAND OPERATOR...

with a possible left or right parenthesis.

The parsing order allows the assembler to properly interpret

characters. For example, the Ò*Ó which represents both multiply

and instruction pointer, is interpreted as:

WORD Deﬁne Constant Directive

The format for the WORD directive is:

WORD 32-bit-operand

The function of this directive is to define a constant in memory. The

WORD directive can have only one operand (32-bit value) which

can contain the actual value (decimal, hexadecimal, or ASCII).

Alternatively, the operand can be an expression which can be

assigned a numeric value by the assembler. An ASCII string is

recognized when characters are enclosed inside single quotes (' ').

Each character (seven bits) is assigned to a byte of memory, with the

eighth bit (MSB) always equal to zero. If only one byte is entered,

the byte is right justified. Any number of ASCII characters may be

entered for each WORD directive, and the characters are right

justified, but truncation occurs after four characters.

*** IP * IP

*+* IP + IP

2** 2 * IP

*&&16 IP AND &16

1 2 ... 314 315 316 317 318 319 320 321 322 323 324 ... 517 518

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Motorola MVME2600 Series User Manual Page 319

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