參數(shù)資料
型號: P610ARM-FPNR
廠商: Zarlink Semiconductor Inc.
英文描述: General purpose 32-bit microprocessor
中文描述: 通用32位微處理器
文件頁數(shù): 72/173頁
文件大?。?/td> 897K
代理商: P610ARM-FPNR
Instruction Set - SWP
ARM610 Data Sheet
4-44
O
4.10.2 Use of R15
Do not use R15 as an operand (Rd, Rn or Rs) in a SWP instruction.
4.10.3 Data aborts
If the address used for the swap is unacceptable to a memory management system,
the memory manager can flag the problem by driving ABORT HIGH. This can happen
on either the read or the write cycle (or both), and in either case, the Data Abort trap
will be taken. It is up to the system software to resolve the cause of the problem, then
the instruction can be restarted and the original program continued.
4.10.4 Instruction cycle times
Swap instructions take 1S + 2N +1I incremental cycles to execute, where S,N and I are
as defined in
·
6.2 Cycle Typeson page 6-2.
4.10.5 Assembler syntax
<SWP>{cond}{B} Rd,Rm,[Rn]
{cond}
two-character condition mnemonic. See
·
Table 4-2:
Condition code summaryon page 4-6.
{B}
if B is present then byte transfer, otherwise word transfer
Rd,Rm,Rn
are expressions evaluating to valid register numbers
4.10.6 Examples
SWP
R0,R1,[R2]
; Load R0 with the word addressed by R2, and
; store R1 at R2.
; Load R2 with the byte addressed by R4, and
; store bits 0 to 7 of R3 at R4.
; Conditionally swap the contents of the
; word addressed by R1 with R0.
SWPB
R2,R3,[R4]
SWPEQ R0,R0,[R1]
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