s3c2410a Samsung Semiconductor, Inc., s3c2410a Datasheet - Page 98
s3c2410a
Manufacturer Part Number
s3c2410a
Description
16/32-bit Risc Arm Microprocessor
Manufacturer
Samsung Semiconductor, Inc.
Datasheet
1.S3C2410A.pdf
(599 pages)
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ARM INSTRUCTION SET
IMMEDIATE OPERAND ROTATES
The immediate operand rotate field is a 4-bit unsigned integer which specifies a shift operation on the 8-bit immediate
value. This value is zero extended to 32 bits, and then subject to a rotate right by twice the value in the rotate field.
This enables many common constants to be generated, for example all powers of 2.
WRITING TO R15
When Rd is a register other than R15, the condition code flags in the CPSR may be updated from the ALU flags as
described above.
When Rd is R15 and the S flag in the instruction is not set the result of the operation is placed in R15 and the CPSR
is unaffected.
When Rd is R15 and the S flag is set the result of the operation is placed in R15 and the SPSR corresponding to the
current mode is moved to the CPSR. This allows state changes which atomically restore both PC and CPSR. This
form of instruction should not be used in User mode.
USING R15 AS AN OPERANDY
If R15 (the PC) is used as an operand in a data processing instruction the register is used directly.
The PC value will be the address of the instruction, plus 8 or 12 bytes due to instruction prefetching. If the shift
amount is specified in the instruction, the PC will be 8 bytes ahead. If a register is used to specify the shift amount
the PC will be 12 bytes ahead.
TEQ, TST, CMP AND CMN OPCODES
The TEQP form of the TEQ instruction used in earlier ARM processors must not be used: the PSR transfer
operations should be used instead.
The action of TEQP in the ARM920T is to move SPSR_<mode> to the CPSR if the processor is in a privileged mode
and to do nothing if in User mode.
INSTRUCTION CYCLE TIMES
Data Processing instructions vary in the number of incremental cycles taken as follows:
NOTE:
3-16
Normal data processing
Data processing with register specified shift
Data processing with PC written
Data processing with register specified shift and PC written
TEQ, TST, CMP and CMN do not write the result of their operation but do set flags in the CPSR. An
assembler should always set the S flag for these instructions even if this is not specified in the mnemonic.
S, N and I are as defined sequential (S-cycle), non-sequential (N-cycle), and internal (I-cycle) respectively.
Processing Type
Table 3-4. Incremental Cycle Times
NOTE
1S
1S + 1I
2S + 1N
2S + 1N +1I
Cycles
S3C2410A
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