Label: ＦＥＸＰ Function: Floating point exponential function with base e
Reference address：Floating point exponential function with base e
Entry condition: The operand is in [R0].
Exit information: When OV=0, the result is still in [R0]. When OV=1, overflow occurs.
Affected resources: DPTR, PSW, A, B, R2~R7, bits 1EH, 1FH Stack requirement: 6 bytes
FEXP: MOV R5,#1; The weighting coefficient is 1.44272 (Lng2e)
MOV R6,#0B8H
MOV R7,#0ABH
EXP: CLR 1EH; The weighting coefficient is a positive number
LCALL MVR0; Transfer [R0] to the first work area
LCALL MUL1; Perform weighted operation
SJMP E20; Uniform exponentiation with base 2
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