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Floating-point Math Instructions Section 3-14
Description FSTR(448) expresses the 32-bit floating-point number in S+1 and S
(IEEE754-format) in decimal notation or scientific notation according to the
control data in words C to C+2, converts the number to ASCII text, and out-
puts the result to the destination words starting at D.
The following diagram shows the contents of the 3 control words.
• The content of C (Data format) specifies whether to express the number
in S+1, S in decimal notation or scientific notation.
• Decimal notation
Expresses a real number as an integer and fractional part.
Example: 124.56
• Scientific notation
Expresses a real number as an integer part, fractional part, and expo-
nent part.
Example: 1.2456E-2 (1.2456
×10
-2
)
• The content of C+1 (Total characters) specifies the number of ASCII char-
acters after conversion including the sign symbol, numbers, decimal point
and spaces.
• The content of C+2 (Fractional digits) specifies the number of digits (char-
acters) below the decimal point.
The ASCII text is stored in D and subsequent words in the following order:
leftmost byte of D, rightmost byte of D, leftmost byte of D+1, rightmost byte of
D+1, etc.
Index Registers ---
Indirect addressing
using Index Registers
,IR0 to ,IR15
–2048 to +2047 ,IR0 to –2048 to +2047 ,IR15
DR0 to DR15, IR0 to IR15
,IR0+(++) to ,IR15+(++)
,–(– –)IR0 to, –()IR15
,IR0 to ,IR15
Area S C D
0000 hex: Decimal format
0001 hex: Scientific notation
0002 to 0018 hex (2 to 24 characters, see note)
0000 to 0007 hex (see note)
Note: There are limits on the total number of characters
and the number of fractional digits. See Limits on the
Number of ASCII Characters on page 519 for details.
Data format
Total characters
Fractional digits
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