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80C187 Datasheet(PDF) 4 Page - Intel Corporation |
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80C187 Datasheet(HTML) 4 Page - Intel Corporation |
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4 / 30 page  80C187 Numeric Operands A typical NPX instruction accepts one or two oper- ands and produces one (or sometimes two) results In two-operand instructions one operand is the con- tents of an NPX register while the other may be a memory location The operands of some instructions are predefined for example FSQRT always takes the square root of the number in the top stack ele- ment (refer to the section on Data Registers) Register Set Figure 2 shows the 80C187 register set When an 80C187 is present in a system programmers may use these registers in addition to the registers nor- mally available on the CPU DATA REGISTERS 80C187 computations use the extended-precision real data type Table 1 Data Type Representation in Memory 270640 – 2 NOTES 1 S e Sign bit (0 e Positive 1 e Negative) 2 dn e Decimal digit (two per byte) 3 X e Bits have no significance 80C187 ignores when loading zeros when storing 4 U e Position of implicit binary point 5 I e Integer bit of significand stored in temporary real implicit in single and double precision 6 Exponent Bias (normalized values) Single 127 (7FH) Double 1023 (3FFH) Extended Real 16383 (3FFFH) 7 Packed BCD (b1)S (D17 D0) 8 Real (b1)S (2E-BIAS)(F0 F1 ) 4 |
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