Label: ＤＴＯＦ Function: Convert double-byte hexadecimal fixed-point number to formatted floating-point number
Reference address：Convert a double-byte hexadecimal fixed-point number into a formatted floating-point number
Entry condition: The absolute value of the two-byte fixed-point number is in [R0], the sign is in bit 1FH, and the number of digits in the integer part is in A.
Exit information: Converted into a formatted floating-point number in [R0] (three bytes).
Affected resources: PSW, A, R2, R3, R4, bit 1FH Stack requirement: 6 bytes
DTOF: MOV R2,A; Initialize the exponent according to the number of digits in the integer
MOV A,@R0; Use the fixed-point number as the mantissa
MOV R3,A
INC R0
MOV A,@R0
MOV R4,A
DEC R0
LCALL RLN; Normalize
LJMP MOV0; Transfer the result to [R0]
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