Echelon Neuron - Manual (Page 145)

DATA.B (Reserve Initialized Memory)
The DATA.B directive is used to reserve memory and initialize the reserved
memory to specific values.
See also RES (Reserve Uninitialized Memory).
Syntax:
The DATA.B directive requires an expression, or a list of expressions separated
by commas. A label is optional.
DATA.B expr
DATA.B expr, expr, ...
label
DATA.B expr
label
DATA.B expr, expr, ...
The assembler reserves a block of data with a size, in bytes, that matches the
number of expressions in the argument, and initializes each byte to the
corresponding expression's value.
The expr expression can have one of the following forms:
• A numeric expression with a value in the range 0..255. Each number,
which can be a constant of a symbolic expression resolved by the linker,
represents one byte of initialized data. For example:
DATA.B h’12, h’34, h’56
• A double-quoted string argument that represents a number of bytes equal
to the number of characters in the string (there is no zero termination
byte). Each character represents one initialized data byte. Because a
string has no implicit termination byte, a single character string in a
DATA.B directive is the same as an ASCII character constant. For
example:
DATA.B “The quick brown fox”
• A pointer expression consists of the PTR keyword followed by an
expression. For example:
DATA.B PTR expr
The expr expression is interpreted as a two-byte constant, and can have
values in the range 0..65535. The expression is a general expression, and
can be any combination of relocatable symbols, imported or exported
symbols, and any applicable operations defined for expressions.
Examples:
The following example defines a look-up table of three constant bytes:
SEG CODE
ORG
APEXP %lookupTable
Neuron Assembly Language Reference 135