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ST20-C1 Datasheet(PDF) 62 Page - STMicroelectronics

Part # ST20-C1
Description  Instruction Set Reference Manual
PDF  205 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST20-C1 Datasheet(HTML) 62 Page - STMicroelectronics

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5.6 Scaling
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®
Under shifting (by less than 8) is used for magnitude reduction (most suitable for
smacloop) by 4 bits (x16) using mac_scale=1 or 8 bits (x256) using mac_scale=0.
Under-shifting by 4 bits is shown in Figure 5.5, and by 8 bits in Figure 5.6.
Figure 5.5 Coefficient scaling with mac_mode set to 1
Figure 5.6 Coefficient scaling with mac_mode set to 0
Y data value
0
15
Add to internal accumulator
0
47
35
0
23
X data value
0
15
<< 4
4
4
Y data value
0
15
Add to internal accumulator
0
47
31
0
23
X data value
0
15



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