12.4. Debug register descriptions
Table 12.5 shows
definitions of terms used in the register descriptions.
Table 12.5. Terms used in register descriptions
| Term | Description |
|---|
| R | Read-only. Written values are ignored. |
| W | Write-only. This bit cannot be read.
Reads return an Unpredictable value. |
| RW | Read or write. |
| RAZ | Read-As-Zero. Always zero when read. |
| RAO | Read-As-One. Always one when read. |
| SBZP | Should-Be-Zero (SBZ)
or Preserved (P). Must be written as 0 or preserved
by writing the same value previously read from the same fields on
the same processor. These bits are usually reserved for future expansion. |
| UNP | A read from this bit returns an Unpredictable
value. |
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