DSPIC30F2010 MICROCHIP [Microchip Technology], DSPIC30F2010 Datasheet - Page 15

• Manufacturer Part Number: DSPIC30F2010
• Description: High-Performance, 16-Bit Digital Signal Controllers
• Manufacturer: MICROCHIP [Microchip Technology]

2.4
The DSP engine consists of a high-speed 17-bit x
17-bit multiplier, a barrel shifter, and a 40-bit adder/sub-
tracter (with two target accumulators, round and
saturation logic).
The DSP engine also has the capability to perform inher-
ent
require no additional data. These instructions are ADD,
SUB and NEG.
TABLE 2-2:
© 2006 Microchip Technology Inc.
CLR
ED
EDAC
MAC
MAC
MOVSAC
MPY
MPY.N
MSC
accumulator-to-accumulator
DSP Engine
Instruction
DSP INSTRUCTION SUMMARY
operations,
which
Algebraic Operation
A = 0
A = (x – y)
A = A + (x – y)
A = A + (x * y)
A = A + x
No change in A
A = x * y
A = – x * y
A = A – x * y
2
The DSP engine has various options selected through
various bits in the CPU Core Configuration Register
(CORCON), as listed below:
1.
2.
3.
4.
5.
6.
7.
A block diagram of the DSP engine is shown in
Figure 2-2.
2
Note:
2
Fractional or integer DSP multiply (IF).
Signed or unsigned DSP multiply (US).
Conventional or convergent rounding (RND).
Automatic saturation on/off for ACCA (SATA).
Automatic saturation on/off for ACCB (SATB).
Automatic saturation on/off for writes to data
memory (SATDW).
Accumulator
(ACCSAT).
For CORCON layout, see Table 3-3.
dsPIC30F2010
Saturation
ACC WB?
mode
DS70118G-page 13
Yes
Yes
Yes
Yes
No
No
No
No
No
selection