s3c2410a Samsung Semiconductor, Inc., s3c2410a Datasheet - Page 138
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
COPROCESSOR REGISTER TRANSFERS (MRC, MCR)
The instruction is only executed if the condition is true. The various conditions are defined in Table 3-2.. The
instruction encoding is shown in Figure 3-27.
This class of instruction is used to communicate information directly between ARM920T and a coprocessor. An
example of a coprocessor to ARM920T register transfer (MRC) instruction would be a FIX of a floating point value
held in a coprocessor, where the floating point number is converted into a 32-bit integer within the coprocessor, and
the result is then transferred to ARM920T register. A FLOAT of a 32 bit value in ARM920T register into a floating
point value within the coprocessor illustrates the use of ARM920T register to coprocessor transfer (MCR).
An important use of this instruction is to communicate control information directly from the coprocessor into the
ARM920T CPSR flags. As an example, the result of a comparison of two floating point values within a coprocessor
can be moved to the CPSR to control the subsequent flow of execution.
THE COPROCESSOR FIELDS
The CP# field is used, as for all coprocessor instructions, to specify which coprocessor is being called upon.
The CP Opc, CRn, CP and CRm fields are used only by the coprocessor, and the interpretation presented here is
derived from convention only. Other interpretations are allowed where the coprocessor functionality is incompatible
with this one. The conventional interpretation is that the CP Opc and CP fields specify the operation the coprocessor
is required to perform, CRn is the coprocessor register which is the source or destination of the transferred
information, and CRm is a second coprocessor register which may be involved in some way which depends on the
particular operation specified.
3-56
31
Cond
28
27
1110
Figure 3-27. Coprocessor Register Transfer Instructions
24
23
CP Opc
[3:0] Coprocessor Operand Register
[7:5] Coprocessor Information
[11:8] Coprocessor Number
[15:12] ARM Source/Destination Register
[19:16] Coprocessor Source/Destination Register
[20] Load/Store Bit
0 = Store to coprocessor
1 = Load from coprocessor
[21] Coprocessor Operation Mode
[31:28] Condition Field
21
20
L
19
CRn
16
15
Rd
12
11
CP#
8 7
CP
5 4 3
1
CRm
0
S3C2410A
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