Chapter 6 Applied Instructions
6-341
API Instruction code Operand
Function
1513 FEXP P
S, D
An exponent of the floating-point
number
Device
X Y M S T C HC D L SM SR E PR K 16# “$” DF
Pulse instruction
16-bit instruction (5-6 steps)
32-bit instruction
Symbol:
S
：
Source device Double word
D
：
Device in which the operation result is
stored
Double word
Explanation:
1. Exponentiation involves two numbers, the base e which represents 2.71828, and the exponent
in the device specified by S.
2. EXP[D+1, D]=[S+1, S].
3. The number in the device specified by S can be a positive number or a negative number. The
register specified by D should be a 32-bit register, and the number in the device specified by S
should be a floating-point number.
4. The value in the register specified by D is e
S
. (e is 2.71828, and S represents the source data.)
5. If the absolute value of the conversion result is larger than the value which can be represented
by the maximum floating-point number, the value in the register specified by D is 16#7F800000,
and SM602 is ON.
6. If the operation result stored in D is 0, SM600 is ON.
Example:
1. When X0.0 is ON, the value in (D1, D0) is converted into the floating-point number, and the
conversion result is stored in (D11, D10).
2. When X0.1 is ON, the exponentiation with the value in (D11, D10) as the exponent is
performed. The result is a floating-point number, and is stored in (D21, D20).
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