C187-Supported Data Types - Intel 80C186XL User Manual

MATH COPROCESSING
Word
Magnitude
S
Integer
15
Short
S
Integer
31
Long
S
Integer
63
Packed
S X
Decimal
79
Short Biased
S
Real
Exponent
31
Long
Biased
S
Exponent
Real
63
Temporary
S
Real
79
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)
11-8
Increasing Significance
(Two's Complement)
0
Magnitude
Magnitude
d
d d d d
d
15
17 16 14 13
72
Significand
23
I
52
I
Biased
Exponent
I
64 63
Figure 11-1. 80C187-Supported Data Types
(Two's Complement)
0
Magnitude
d
d d
10 d 9 d
11 7
12 8
0
Significand
Significand
(Two's
Complement)
0
d
d d d d d d
3
6 5 4 2 1 0
0
0
A1257-0A