Directives That Initialize Constants - Texas Instruments TMS320C3 Series User Manual

Directives That Initialize Constants

6.3 Directives That Initialize Constants
Several directives assemble values for the current section.
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The .byte directive places one or more 8-bit values into consecutive words
in the current section. A byte in this case uses all 32 bits of the word placing
0s into the upper 24 bits.
The .fill directive reserves a specified number of words in the current sec-
tion with a value. The assembler advances the SPC and skips the re-
served words. When you use a label with .fill, it points to the first word of
the reserved block.
The .float directive converts an expression value into a 32-bit
TMS320C3x floating-point constant. This format has an 8-bit exponent
and a 24-bit mantissa.
The .float16 directive converts an expression value into a 16-bit
TMS320C3x floating-point constant. This format has an 8-bit exponent
and an 8-bit mantissa. The format is identical to that used by the .sfloat
directive of the TMS320C32. The upper 16 bits are not used and are filled
with 0s.
The .float8 directive converts an expression value into an 8-bit
TMS320C3x floating-point constant. This format has a 4-bit exponent and
a 4-bit mantissa. This format can be used for a quick logarithm approxima-
tion. The upper 24 bits are not used and are filled with 0s.
The .ieee directive calculates the 32-bit IEEE floating-point representation
of a single precision floating-point value.
The .int directive places one or more 16-bit values into consecutive words
in the current section. The upper 16 bits are not used and are filled with
0s.
The .long directive places one or more 32-bit values into consecutive by-
tes in the current section.
The .pfloat16 directive converts an expression value into a 16-bit floating-
point constant. The values are packed into consecutive fields of memory.
The .pfloat8 directive converts an expression value into an 8-bit floating-
point constant. The values are packed into consecutive fields of memory.
The .q xx directive places one or more 16-bit, signed 2s-complement val-
ues into consecutive words in the current section. Note that the decimal
point is displaced xx places from the LSB (least significant bits.)