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MATH COPROCESSING
11-8
Figure 11-1. 80C187-Supported Data Types
Increasing Significance
Word
Integer
Packed
Decimal
Short
Real
Temporary
Real
(Two's Complement)
Short
Integer
Long
Integer
Long
Real
S
0
Magnitude
15
S
031
Magnitude
(Two's Complement)
(Two's
Complement)
S
0
63
Magnitude
72
79
Magnitude
S
0
Biased
Exponent
Significand
I
31
23
S
063
52
I
Biased
Exponent
Significand
S
I
79
64 63
0
Biased
Exponent
Significand
S X
d
17
d
16
d
15
d
14
d
13
d
12
d
11
d
10
d
9
d
8
d
7
d
6
d
5
d
4
d
3
d
2
d
1
d
0
NOTES:
S = Sign bit (0 = positive, 1 = negative)
d
n
= Decimal digit (two per byte)
X = Bits have no significance; 80C187 ignores when loading, zeros when storing.
= Position of implicit binary point
I = Integer bit of significand; stored in temporary real, implicit in short and long real
Exponent Bias (normalized values):
Short Real: 127 (7FH)
Long Real: 1023 (3FFH)
Temporary Real: 16383 (FFFH)
A1257-0A