參數(shù)資料
型號: ARM60
廠商: Zarlink Semiconductor Inc.
英文描述: Low power, general purpose 32-bit RISC microprocessor
中文描述: 低功耗,通用32位RISC微處理器
文件頁數(shù): 64/120頁
文件大小: 1275K
代理商: ARM60
P60ARM-B
60
4.14 UndeTned instruction
The instruction is only executed if the condition is true. The various conditions are defined at the beginning
of this chapter. The instruction format is shown in
Figure 28: Undefined Instruction
.
If the condition is true, the undefined instruction trap will be taken.
Figure 28: Undefined Instruction
Note that the undefined instruction mechanism involves offering this instruction to any coprocessors which
may be present, and all coprocessors must refuse to accept it by driving
CPA
and
CPB
HIGH. For systems
without a coprocessor, CPA and CPB must be driven HIGH at all times.
4.14.1 Assembler syntax
At present the assembler has no mnemonics for generating this instruction. If it is adopted in the future for
some specified use, suitable mnemonics will be added to the assembler. Until such time, this instruction
shall not be used.
Cond
0
24
27
28
31
5
4
3
1
011
xxxx
25
xxxxxxxxxxxxxxxxxxxx
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