Microchip Technology dsPIC30F - Page 39

© 2004 Microchip Technology Inc. DS70049C-page 2-21
Section 2. CPU
CPU
2
Figure 2-9: Integer and Fractional Representation of 0x4001
Figure 2-10: Integer and Fractional Representation of 0xC002
Different Representations of 0x4001
Integer:
-2
15
2
14
2
13
2
12
. . . .
0x4001 = 2
14
+ 2
0
= 16385
1.15 Fractional:
2
-15
0
2
-1
2
-2
2
-3
. . .
-2
0
2
0
0x4001 = 2
-1
+ 2
-15
= 0.500030518
Implied Radix Point
.
1 10000000000000
01 10000000000000
Different Representations of 0xC002
Integer:
-2
15
2
14
2
13
2
12
. . . .
0xC002 = -2
15
+ 2
14
+ 2
0
= -32768 + 16384 + 2 = -16382
1.15 Fractional:
2
-15
. 2
-1
2
-2
2
-3
. . .
-2
0
2
0
0xC002 = -2
0
+ 2
-1
+ 2
-14
= -1 + 0.5 + 0.000061035 = -0.499938965
Implied Radix Point
11 00000000000001
11 00000000000001