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MC68340 Datasheet(PDF) 168 Page - Freescale Semiconductor, Inc

Part # MC68340
Description  Integrated Processor with DMA User?셲 Manual
PDF  441 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MC68340 Datasheet(HTML) 168 Page - Freescale Semiconductor, Inc

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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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