Table Example 3: 8-Bit Independent Variable - Motorola CPU32 Reference Manual

4.6.3 Table Example 3: 8-Bit Independent Variable

Y
This example shows how to use a table instruction within an interpolation subroutine.
Independent variable X is calculated as an 8-bit value, allowing 16 levels of interpola-
tion on a 17-entry table. X is passed to the subroutine, which returns an 8-bit result.
The subroutine uses the following data, based on the function shown in Figure 4-5.
CPU32
REFERENCE MANUAL
1024 2048
INDEPENDENT VARIABLE
Figure 4-5 Table Example 3
X X
(Subroutine) (Instruction)
0 0
1 256
2 512
3 768
4 1024
5 1280
6 1536
7 1792
8 2048
9 2304
10 2560
11 2816
12 3072
13 3328
14 3584
15 3840
16 4096
INSTRUCTION SET
3072 4096
X
Y
0
16
32
48
64
80
96
112
128
112
96
80
64
48
32
16
0
MOTOROLA
4-191