Toshiba T2N - Manual (Page 195)

3. User Data
182 PROSEC T2N
(7) Floating Point Data
This is a real number which is expressed using 2 consecutive
registers (32-bit).
The registers are designated in the form A +1• A . Internally, the
following format is used. (conforms to IEEE754)
(MSB) (LSB)
Value = (Sign)1.(Mantissa)
×
2 (Exponent-127)
The floating point data is used with the following floating point
instructions. Therefore, there is no need for user to consider the
format.
● Conversions (Floating point
↔
Double-length integer)
● Floating point arithmetics
● Floating point comparisons
The following table shows the numerical range in which the floating
point data can be processed.
F - - - - - - - - - - - - - - - - - - - 0
                   
▼
Sign (0: +, 1: -)
                    
▼
Bit positions
Exponent
(8 bits)
Mantissa (23 bits)
Register A +1 Register A
×
F E - - - - - - 7 6 - - - - 0
Numerical Value Expression Remarks
3.40282 × 10 38 3.40282E38 Maximum
∫ ∫
1.17549 × 10 -38 1.17549E-38 Nearest to 0
0 0
- 1.17549
×
10 -38 - 1.17549E-38 Nearest to 0
∫ ∫
- 3.40282 × 10 38 - 3.40282E38 Minimum