Motorola MPC823e Reference Manual page 230

Memory Management Unit
PP2 SETTING
0x
1x
x1
x0
PP3—Protection for the Third 1K Subpage in a 4K Page
This field contains protection code for the third subpage in a 4K page. Depending on the
encoding mode, this field has different meanings.
PP3 INSTRUCTION PAGES
SETTING
PRIVILEGED MODE
00 No access
01 Executable
10 Executable
11 Executable
PAGES OVER 4K WITH 4K RESOLUTION PROTECTION
PP3 SETTING
0x
1x
x0
x1
11-12
PAGES OVER 4K WITH 4K RESOLUTION PROTECTION
PP1 contains PowerPC encoding
PP1 contains Extended Encoding
Page is writable
Page is write-protected
4K PAGES WITH 1K RESOLUTION PROTECTION
PROBLEM MODE
No access
No access
Executable
Executable
CASE: Mx_CTR (PPCS) = 0
First subpage not valid
First subpage valid
Second subpage not valid
Second subpage valid
MPC823e REFERENCE MANUAL
DATA PAGES
PRIVILEGED MODE PROBLEM MODE
No access No access
Read/Write No access
Read/Write Read-only
Read/Write Read/Write
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