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MC68340 Datasheet(PDF) 168 Page - Freescale Semiconductor, Inc |
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MC68340 Datasheet(HTML) 168 Page - Freescale Semiconductor, Inc |
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168 / 441 page ![]() MOTOROLA MC68340 USER’S MANUAL 5- 31 The table instruction is executed with the following bit pattern in Dx: 31 16 15 0 NOT USED 1010001110000000 Table Entry Offset ⇒ Dx [8:15] = $A3 = 163 Interpolation Fraction ⇒ Dx [0:7] = $80 = 128 Using this information, the table instruction calculates dependent variable Y: Y = 1669 + (128 (1679 – 1669)) / 256 = 1674 5.3.4.2 TABLE EXAMPLE 2: COMPRESSED TABLE. In Example 2 (see Figure 5-8), the data from Example 1 has been compressed by limiting the maximum value of the independent variable. Instead of the range 0 ≤ X = 65535, X is limited to 0 ≤ X ≤ 1023. The table has been compressed to only five entries, but up to 256 levels of interpolation are allowed between entries. X 256 512 786 1024 INDEPENDENT VARIABLE Y Figure 5-8. Table Example 2 NOTE Extreme table compression with many levels of interpolation is possible only with highly linear functions. The table entries within the range of interest are listed in Table 5-14. Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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