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S3C4530A Datasheet(PDF) 93 Page - Samsung semiconductor

Part No. S3C4530A
Description  16/32-bit RISC microcontroller is a cost-effective, high-performance microcontroller
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Maker  SAMSUNG [Samsung semiconductor]
Homepage  http://www.samsung.com/Products/Semiconductor
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S3C4530A Datasheet(HTML) 93 Page - Samsung semiconductor

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S3C4530A
INSTRUCTION SET
3-51
COPROCESSOR DATA OPERATIONS (CDP)
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 3-25.
This class of instruction is used to tell a coprocessor to perform some internal operation. No result is
communicated back to ARM7TDMI, and it will not wait for the operation to complete. The coprocessor could
contain a queue of such instructions awaiting execution, and their execution can overlap other activity, allowing
the coprocessor and ARM7TDMI to perform independent tasks in parallel.
COPROCESSOR INSTRUCTIONS
The S3C4530A, unlike some other ARM-based processors, does not have an external coprocessor interface. It
does not have a on-chip coprocessor also.
So then all coprocessor instructions will cause the undefined instruction trap to be taken on the S3C4530A. These
coprocessor instructions can be emulated by the undefined trap handler. Even though external coprocessor can
not be connected to the S3C4530A, the coprocessor instructions are still described here in full for completeness.
(Remember that any external coprocessor described in this section is a software emulation.)
31
24
27
19
15
Cond
CRm
28
16
11
12
23
20
[3:0] Coprocessor operand register
[7:5] Coprocessor information
[11:8] Coprocessor number
[15:12] Coprocessor destination register
[19:16] Coprocessor operand register
[23:20] Coprocessor operation code
[31:28] Condition Field
0
Cp
Cp#
CRd
CRn
1110
CP Opc
8 7
5 4 3
0
Figure 3-25. Coprocessor Data Operation Instruction
THE COPROCESSOR FIELDS
Only bit 4 and bits 24 to 31 are significant to ARM7TDMI. The remaining bits are used by coprocessors. The
above field names are used by convention, and particular coprocessors may redefine the use of all fields except
CP# as appropriate. The CP# field is used to contain an identifying number (in the range 0 to 15) for each
coprocessor, and a coprocessor will ignore any instruction which does not contain its number in the CP# field.
The conventional interpretation of the instruction is that the coprocessor should perform an operation specified in
the CP Opc field (and possibly in the CP field) on the contents of CRn and CRm, and place the result in CRd.


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