dsp56800e Freescale Semiconductor, Inc, dsp56800e Datasheet - Page 521

• Manufacturer Part Number: dsp56800e
• Description: 16-bit Digital Signal Controller Core
• Manufacturer: Freescale Semiconductor, Inc

MAC
Instruction Fields:
Parallel Moves:
Parallel Dual Reads:
Freescale Semiconductor
Operation
1.The case where the destination of the data ALU operation is the same register as the destination of the par-
allel read operation is not allowed. Memory writes are allowed in this case.
2.This instruction occupies only 1 program word and executes in 1 cycle for every addressing mode.
1.This instruction is not allowed when the XP bit in the OMR is set (that is, when the instructions are executing
from data memory).
2.This instruction occupies only 1 program word and executes in 1 cycle for every addressing mode.
Operation
MAC
MAC
Data ALU Operation
Operation
MAC
2
2
Data ALU Operation
Operands
Y1,X0,F
Y1,Y0,F
Y0,X0,F
C1,Y0,F
(±)FFF1,FFF1,FFF
1
Operands
Operands
–C1,Y0,F
–C1,Y1,F
Multiply-Accumulate
Y1,X0,F
Y0,X0,F
Y1,Y0,F
Y0,Y0,F
A1,Y0,F
B1,Y1,F
C1,Y0,F
C1,Y1,F
Instruction Set Details
Source 1
X:(R0)+N
X:(R1)+N
X:(R4)+N
X:(R0)+N
X:(R4)+N
X:(R0)+
X:(R1)+
X:(R4)+
X:(R0)+
X:(R4)+
First Memory Read
C
1
Destination 1
W
1
Y0
Y1
Y0
Y1
Fractional multiply-accumulate; multiplication
result optionally negated before accumulation.
X:(Rj)+N
Source
X:(Rj)+
X0
Y1
Y0
A1
B1
C
A
B
Parallel Memory Move
X:(R3)+N3
X:(R3)+N3
Source 2
X:(R3)+
X:(R3)–
X:(R3)+
X:(R3)+
Second Memory Read
Comments
Destination
X:(Rj)+N
X:(Rj)+
Destination 2
X0
Y1
Y0
A1
B1
C
A
B
MAC
X0
X0
C
1
A-177