485
Floating-point Math Instructions Section 3-14
Description +F(454) adds the 32-bit floating-point number in Ad+1 and Ad to the 32-bit
floating-point number in Au+1 and Au and places the result in R+1 and R.
(The floating point data must be in IEEE754 format.)
If the absolute value of the result is greater than the maximum value that can
be expressed as floating-point data, the Overflow Flag will turn ON and the
result will be output as
±∞.
If the absolute value of the result is less than the minimum value that can be
expressed as floating-point data, the Underflow Flag will turn ON and the
result will be output as 0.
The various combinations of augend and addend data will produce the results
shown in the following table.
Note (1) The results could be zero (including underflows), a numeral, +
∞, or –∞.
(2) The Error Flag will be turned ON and the instruction will not be executed.
Flags
Indirect DM addresses
in binary
@ D0 to @ D32767
Indirect DM addresses
in BCD
*D0 to *D32767
Constants #00000000 to #FFFFFFFF (binary) ---
Data Registers ---
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
Area Au Ad R
Augend
Addend 0 Numeral +∞ –∞ NaN
0 0 Numeral +∞ –∞
Numeral Numeral See note 1. +∞ –∞
+∞ +∞ +∞ +∞
See note 2.
–∞ –∞ –∞ See note 2. –∞
NaN See note 2.
R+1 R
+
Au
Au+1
Ad
Ad+1
Result (floating-point data, 32 bits)
Augend (floating-point data, 32 bits)
Addend (floating-point data, 32 bits)
Name Label Operation
Error Flag ER ON if the augend or addend data is not recognized as
floating-point data.
ON if the augend or addend data is not a number (NaN).
ON if +∞ and –∞ are added.
OFF in all other cases.
Equals Flag = ON if both the exponent and mantissa of the result are 0.
OFF in all other cases.
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