s3c4510b Samsung Semiconductor, Inc., s3c4510b Datasheet - Page 96
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
ADDRESSING MODES
ARM7TDMI is responsible for providing the address used by the memory system for the transfer, and the
addressing modes available are a subset of those used in single data transfer instructions. Note, however, that
the immediate offsets are 8 bits wide and specify word offsets for coprocessor data transfers, whereas they are
12 bits wide and specify byte offsets for single data transfers.
The 8 bit unsigned immediate offset is shifted left 2 bits and either added to (U = 1) or subtracted from (U = 0)
the base register (Rn); this calculation may be performed either before (P = 1) or after (P = 0) the base is used as
the transfer address. The modified base value may be overwritten back into the base register (if W = 1), or the
old value of the base may be preserved (W = 0). Note that post-indexed addressing modes require explicit
setting of the W bit, unlike LDR and STR which always write-back when post-indexed.
The value of the base register, modified by the offset in a pre-indexed instruction, is used as the address for the
transfer of the first word. The second word (if more than one is transferred) will go to or come from an address
one word (4 bytes) higher than the first transfer, and the address will be incremented by one word for each
subsequent transfer.
ADDRESS ALIGNMENT
The base address should normally be a word aligned quantity. The bottom 2 bits of the address will appear on
A[1:0] and might be interpreted by the memory system.
USE OF R15
If Rn is R15, the value used will be the address of the instruction plus 8 bytes. Base write-back to R15 must not
be specified.
DATA ABORTS
If the address is legal but the memory manager generates an abort, the data trap will be taken. The write-back of
the modified base will take place, but all other processor state will be preserved. The coprocessor is partly
responsible for ensuring that the data transfer can be restarted after the cause of the abort has been resolved,
and must ensure that any subsequent actions it undertakes can be repeated when the instruction is retried.
INSTRUCTION CYCLE TIMES
Coprocessor data transfer instructions take (n-1)S + 2N + bI incremental cycles to execute, where:
n
b
S, N and I are defined as sequential (S-cycle), non-sequential (N-cycle), and internal (I-cycle), respectively.
3-54
The number of words transferred.
The number of cycles spent in the coprocessor busy-wait loop.
S3C4510B
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