s3c4510b Samsung Semiconductor, Inc., s3c4510b Datasheet - Page 98
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
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 ARM7TDMI and a coprocessor. An
example of a coprocessor to ARM7TDMI 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 ARM7TDMI register. A FLOAT of a 32 bit value in ARM7TDMI
register into a floating point value within the coprocessor illustrates the use of ARM7TDMI register to coprocessor
transfer (MCR).
An important use of this instruction is to communicate control information directly from the coprocessor into the
ARM7TDMI 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
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