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Floating-point Math Instructions Section 5-24
Flags ER: Indirectly addressed EM/DM word is non-existent.
(Content of *EM/*DM word is not BCD, or the EM/DM area boundary
has been exceeded.)
ON if the multiplicand or multiplier data is not recognized as floating-
point data.
EQ: ON if both the exponent and mantissa of the result are 0.
OF: ON if the absolute value of the result is too large to be expressed as a
32-bit floating-point value. (The result will be output as
±∞.)
UF: ON if the absolute value of the result is too small to be expressed as a
32-bit floating-point value. (The result will be output as 0.)
5-24-8 FLOATING-POINT DIVIDE: /F(––)
Limitations The Dividend (Dd+1 and Dd) and Divisor (Dr+1 and Dr) data must be in
IEEE754 floating-point data format.
DM 6143 to DM 6655 cannot be used for R.
Description When the execution condition is OFF, /F(––) is not executed. When the execu-
tion condition is ON, /F(––) divides the 32-bit floating-point number in Dd+1
and Dd by the 32-bit floating-point number in Dr+1 and Dr 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 (SR 25404) 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 (SR 25405) will turn ON
and the result will be output as 0.
Dd: First dividend word
IR, SR, AR, DM, EM, HR, TIM/CNT, LR
Dr: First divisor word
IR, SR, AR, DM, EM, HR, TIM/CNT, LR
Ladder Symbols
Operand Data Areas
R: First result word
IR, SR, AR, DM, EM, HR, LR
/F(−− )
Dd
Dr
R
@/F(−− )
Dd
Dr
R
R+1
R
Dd
Dividend (floating-point data, 32 bits)
Dd+1
Dr
Divisor (floating-point data, 32 bits)
Dr+1
Result (floating-point data, 32 bits)
÷
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