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S3C4530A Datasheet(Fiches technique) 87 Page - Samsung semiconductor

Numéro de pièce S3C4530A
Description  16/32-bit RISC microcontroller is a cost-effective, high-performance microcontroller
Télécharger  432 Pages
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Fabricant  SAMSUNG [Samsung semiconductor]
Site Internet  http://www.samsung.com/Products/Semiconductor
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 87 page
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S3C4530A
INSTRUCTION SET
3-45
ASSEMBLER SYNTAX
<LDM|STM>{cond}<FD|ED|FA|EA|IA|IB|DA|DB> Rn{!},<Rlist>{^}
where:
{
cond}
Two character condition mnemonic. See Table 3-2.
Rn
An expression evaluating to a valid register number
<Rlist>
A list of registers and register ranges enclosed in {} (e.g. {R0, R2–R7, R10}).
{
!}
If present requests write-back (W = 1), otherwise W = 0.
{
^}
If present set S bit to load the CPSR along with the PC, or force transfer of user
bank when in privileged mode.
Addressing Mode Names
There are different assembler mnemonics for each of the addressing modes, depending on whether the
instruction is being used to support stacks or for other purposes. The equivalence between the names and the
values of the bits in the instruction are shown in the following table 3-6.
Table 3-6. Addressing Mode Names
Name
Stack
Other
L Bit
P Bit
U Bit
Pre-Increment load
LDMED
LDMIB
1
1
1
Post-Increment load
LDMFD
LDMIA
1
0
1
Pre-Decrement load
LDMEA
LDMDB
1
1
0
Post-Decrement load
LDMFA
LDMDA
1
0
0
Pre-Increment store
STMFA
STMIB
0
1
1
Post-Increment store
STMEA
STMIA
0
0
1
Pre-Decrement store
STMFD
STMDB
0
1
0
Post-Decrement store
STMED
STMDA
0
0
0
FD, ED, FA, EA define pre/post indexing and the up/down bit by reference to the form of stack required. The F
and E refer to a “full” or "empty” stack, i.e. whether a pre-index has to be done (full) before storing to the stack.
The A and D refer to whether the stack is ascending or descending. If ascending, a STM will go up and LDM
down, if descending, vice-versa.
IA, IB, DA, DB allow control when LDM/STM are not being used for stacks and simply mean increment after,
increment before, decrement after, decrement before.




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