Typewriter User Manual

5- 30 MC68340 USER’S MANUAL MOTOROLA
Two additional examples show how TBLSN can reduce cumulative error when multiple
table lookup and interpolation operations are used in a calculation. Example 4
demonstrates addition of the results of three table interpolations. Example 5 illustrates use
of TBLSN in surface interpolation.
5.3.4.1 TABLE EXAMPLE 1: STANDARD USAGE. The table consists of 257 word
entries. As shown in Figure 5-7, the function is linear within the range 32768 ≤ X ≤ 49152.
Table entries within this range are as given in Table 5-13 .
Table 5-13. Standard Usage Entries
Entry Number X Value Y Value
128* 32768 1311
162 41472 1659
163 41728 1669
164 41984 1679
165 42240 1690
192* 49152 1966
*These values are the end points of the range.
All entries between these points fall on the line.
X
16384 32768 49152 65536
INDEPENDENT VARIABLE
DEPENDENT VARIABLE
Y
Figure 5-7. Table Example 1
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