ARM PrimeCelL PL320 Technical Reference Manual page 81

Processor
Reserved
Unpredictable
Word
ARM DDI 0306B
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A processor is the circuitry in a computer system required to process data using the
computer instructions. It is an abbreviation of microprocessor. A clock source, power
supplies, and main memory are also required to create a minimum complete working
computer system.
A field in a control register or instruction format is reserved if the field is to be defined
by the implementation, or produces Unpredictable results if the contents of the field are
not zero. These fields are reserved for use in future extensions of the architecture or are
implementation-specific. All reserved bits not used by the implementation must be
written as 0 and read as 0.
For reads, the data returned when reading from this location is unpredictable. It can have
any value. For writes, writing to this location causes unpredictable behavior, or an
unpredictable change in device configuration. Unpredictable instructions must not halt
or hang the processor, or any part of the system.
A 32-bit data item.
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Glossary
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