APPENDIX A I/O Map
Read/write access symbols
R/W: R eadable and writable
R: Read-only
W: Write-only
Initial value symbols
0: The initial value of this bit is "0".
1: The initial value of this bit is "1".
X: The initial value of this bit is indeterminate.
M: The initial value of this bit is determined by the musk option.
Check:
Do not use vacancies.
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