dsp56800 Freescale Semiconductor, Inc, dsp56800 Datasheet - Page 385

• Manufacturer Part Number: dsp56800
• Description: 16-bit Digital Signal Controllers
• Manufacturer: Freescale Semiconductor, Inc

SUB
Parallel Moves:
Parallel Dual Reads:
Timing:
Memory:
Freescale Semiconductor
Operation
1.
are executing from data memory).
2.
mode.
SUB
Data ALU Operation
This parallel instruction is not allowed when the XP bit in the OMR is set (that is, when the instructions
This instruction occupies only 1 program word and executes in 1 instruction cycle for every addressing
2 + mv oscillator clock cycles for SUB instructions with a parallel move
Refer to previous tables for SUB instructions without a parallel move
1 program word for SUB instructions with a parallel move
Refer to previous tables for SUB instructions without a parallel move
2
Operation
1.
cle for every addressing mode.
2.
as the destination of the parallel read operation. Memory writes are allowed in this
case.
SUB
(F = A or B)
Data ALU Operation
This instruction occupies only 1 program word and executes in 1 instruction cy-
The destination of the data ALU operation is not allowed to be the same register
Operands
X0,F
Y1,F
Y0,F
1
1
(F = A or B)
Operands
X0,F
Y1,F
Y0,F
A,B
B,A
X:(R0)+N
X:(R1)+N
Source 1
X:(R0)+
X:(R1)+
Instruction Set Details
First Memory Read
Subtract
X:(Rn)+N
X:(Rn)+
Source
Destination 1
X0
Y1
Y0
A1
B1
A
B
Y0
Y1
Parallel Memory Move
Source 2
X:(R3)+
X:(R3)-
Destination
Second Memory Read
X:(Rn)+N
X:(Rn)+
X0
Y1
Y0
A1
B1
A
B
2
Destination 2
X0
SUB
A-155