s3c4510b Samsung Semiconductor, Inc., s3c4510b Datasheet - Page 90
s3c4510b
Manufacturer Part Number
s3c4510b
Description
16/32-bit Risc Microcontroller
Manufacturer
Samsung Semiconductor, Inc.
Datasheet
1.S3C4510B.pdf
(422 pages)
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INSTRUCTION SET
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.
INSTRUCTION CYCLE TIMES
Swap instructions take 1S + 2N +1I incremental cycles to execute, where S, N and I are defined as squential (S-
cycle), non-sequential, and internal (I-cycle), respectively.
ASSEMBLER SYNTAX
<SWP>{cond}{B} Rd,Rm,[Rn]
{cond}
{B}
Rd,Rm,Rn
Examples
3-48
SWP
SWPB
SWPEQ
Two-character condition mnemonic. See Table 3-2.
If B is present then byte transfer, otherwise word transfer
Expressions evaluating to valid register numbers
R0,R1,[R2]
R2,R3,[R4]
R0,R0,[R1]
; 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.
S3C4510B
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