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ST20-C1 Datasheet(PDF) 60 Page - STMicroelectronics

No. de pieza ST20-C1
Descripción Electrónicos  Instruction Set Reference Manual
PDF  205 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST20-C1 Datasheet(HTML) 60 Page - STMicroelectronics

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5.6 Scaling
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internal format accumulator to a user-visible accumulator.
Figure 5.2 Accumulator scaling
The accumulator is left-shifted 8 bits so that the assumed binary point is moved from
below bit 30 to below bit 38. The accumulator value is saturated from bit 38 upwards.
At the end of the multiply-accumulate sequence the accumulator value is shifted down
(right) by an extra 8 bits to compensate for the left shift of 8 on coefficient inputs.
5.6.2
Coefficient scaling
The standard data format for data and coefficients is 1.15 (Q15). The product of two
1.15 numbers is 2.30. The coefficient value for each multiply-accumulate operation is
pre-scaled before being fed into the multiplier. The shift distances are controlled by the
mac_scale field: of the status register, as shown in Table 5.5.
The standard behavior for 1.15 (Q15) values is to shift the coefficients b y 8 places,
using mac_scale set to 2, which exactly compensates the extra right shift of 8 on the
mac_scale
coefficient shift
00
1
left 4
2
left 8
3
left 9
Table 5.5 mac_scale values
ShortMode and biquad
LongMode
1
1
User-visible accumulator
Internal accumulator
0
47
38
0
15
Internal accumulator
0
47
38
0
31
User-visible accumulator
Implied binary point
Bit initially set for rounding



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