dsp56000 Freescale Semiconductor, Inc, dsp56000 Datasheet - Page 121

• Manufacturer Part Number: dsp56000
• Description: 24-bit Digital Signal Processor Family Manual
• Manufacturer: Freescale Semiconductor, Inc

6.4.5 Move Instructions
The move instructions perform data movement over the XDB and YDB or over the GDB.
Move instructions only affect the CCR bits S and L The S bit is affected if data growth is
detected when the A or B registers are moved onto the bus. The L bit is affected if limiting
is performed when reading a data ALU accumulator register. An address ALU instruction
(LUA) is also included in the following move instructions. The MOVE instruction is the par-
allel move with a data ALU no-operation (NOP).
Note: Due to instruction pipelining, if an AGU register (Mn, Nn, or Rn) is directly changed
with a MOVE-type instruction, the new contents may not be available for use until the sec-
ond following instruction. See the restrictions discussed in SECTION 7 - PROCESSING
STATES on page 7-10.
There are nine classifications of parallel data moves between registers and memory. Fig-
ure 6-15 shows seven parallel moves. The source of the data to be moved and the
destination are separated by a comma.
Examples of the other two classifications, XY and long (L) moves, are shown in Figure 6-
16. Example A illustrates the following steps: 1) register X0 is added to register A and the
result is placed in register A; 2) register X0 is moved to the X memory register location
pointed to by R3, and R3 is incremented; and 3) the contents of the Y memory location
pointed to by R7 is moved to the B register, and R7 is decremented.
Example B depicts the following sequence: 1) register X0 is added to register A and the
result is placed in register A; and 2) registers A and B are moved, respectively, to the loca-
MOTOROLA
LUA
MOVE
MOVEC
MOVEM
MOVEP
Load Updated Address
Move Data Register
Move Control Register
Move Program Memory
Move Peripheral Data
Freescale Semiconductor, Inc.
INSTRUCTION SET INTRODUCTION
For More Information On This Product,
Figure 6-14 Nested DO Loops
INSTRUCTION GROUPS
Go to: www.freescale.com
END2 ADD A,B
END1
DO
DO
MOVE
#n1,END1
:
#n2,END2
:
:
X:(R1)+,X0
A,X:(R0)+
6 - 27