1 move instruction execution timing, Move instruction execution timing -28 – Freescale Semiconductor MCF5480 User Manual
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MCF548x Reference Manual, Rev. 3
3-28
Freescale Semiconductor
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The OEP can complete all memory accesses without memory causing any stalls. Thus, these
timings assume an infinite, zero-wait state memory attached to the core.
•
Operand accesses are assumed to be aligned as follows:
— 16-bit operands are aligned on 0-modulo-2 addresses
— 32-bit operands are aligned on 0-modulo-4 addresses
Operands that do not meet these guidelines are misaligned.
shows how the core
decomposes a misaligned operand reference into a series of aligned accesses.
3.7.1
MOVE Instruction Execution Timing
The following tables show execution times for the MOVE.{B,W,L} instructions.
shows the
timing for the other generic move operations.
NOTE
In these tables, times using PC-relative effective addressing modes are the
same as using An-relative mode.
The (xxx).wl nomenclature refers to both forms of absolute addressing,
(xxx).w and (xxx).l.
lists execution times for MOVE.{B,W} instructions.
Table 3-10. Misaligned Operand References
A[1:0]
Size
Bus Operations
Additional C(R/W)
1
1
Each timing entry is presented as C(r/w), described as follows:
C is the number of processor clock cycles, including all applicable operand fetches and writes, as well as all
internal core cycles required to complete the instruction execution.
r/w is the number of operand reads (r) and writes (w) required by the instruction. An operation performing a
read-modify write function is denoted as (1/1).
x1
Word
Byte, Byte
2(1/0) if read
1(0/1) if write
x1
Long
Byte, Word, Byte
3(2/0) if read
2(0/2) if write
10
Long
Word, Word
2(1/0) if read
1(0/1) if write
ET with {<ea> = (d16,PC)}
equals ET with {<ea> = (d16,An)}
ET with {<ea> = (d8,PC,Xi*SF)}
equals ET with {<ea> = (d8,An,Xi*SF)}
Table 3-11. Move Byte and Word Execution Times
Source
Destination
Rx
(Ax)
(Ax)+
–(Ax)
(d16,Ax)
(d8,Ax,Xi*SF) (xxx).wl
Dy
1(0/0)
1(0/1)
1(0/1)
1(0/1)
1(0/1)
2(0/1)
1(0/1)
Ay
1(0/0)
1(0/1)
1(0/1)
1(0/1)
1(0/1)
2(0/1)
1(0/1)
(Ay)
1(1/0)
2(1/1)
2(1/1)
2(1/1)
2(1/1)
3(1/1)
2(1/1)