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參數(shù)資料
| 型號(hào)： | ARM60 |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | Low Power General Purpose 32-Bit RISC Microprocessor(低功耗通用32位精簡指令集微處理器) |
| 中文描述： | 低功耗通用32位RISC微處理器（低功耗通用32位精簡指令集微處理器） |
| 文件頁數(shù)： | 50/121頁 |
| 文件大?。?/td> | 1217K |
| 代理商： | ARM60 |
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P60ARM-B
46
STM instructions take (n-1)S + 2N incremental cycles to execute.
n
is the number of words transferred.
4.8.9 Assembler syntax
<LDM|STM>{cond}<FD|ED|FA|EA|IA|IB|DA|DB> Rn{!},<Rlist>{^}
{cond} - two character condition mnemonic, see
Figure 6: Condition Codes
Rn is an expression evaluating to a valid register number
<Rlist> is a list of registers and register ranges enclosed in {} (eg {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 equivalences between the names and
the values of the bits in the instruction are shown in the following table:
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 òfulló or òemptyó 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.
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
Table 5:
Addressing Mode Names
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