12.4. Debug register descriptions
Table 12.9 shows
definitions of terms used in the register descriptions.
Table 12.9. 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 (RAZ). Return
a value of zero when read. |
| SBZ | Should-Be-Zero (SBZ).
Should be written as zero (or all 0s for bit fields) by software.
Non-zero values might produce Unpredictable results. |
| SBZP | Should-Be-Zero or Preserved (SBZP).
Should be written as zero (or all 0s for bit fields) or preserved
by writing the same value that has been previously read from the
same fields on the same processor. |
| UNP | A read of this bit returns an Unpredictable
value. |
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