ARM720T Datasheet, PDF (92/242 Pages) List of Unclassifed Manufacturers – General-purpose 32-bit Microprocessor with 8KB cache, enlarged Write buffer, and Memory Management Unit (MMU) combined in a single chip

Memory Management Unit
Supervisor
AP S R Permission
00 0 0 No access
00 1 0 Read only
00 0 1 Read only
00 1 1 Reserved
01 x x Read/write
10 x x Read/write
11 x x Read/write
xx 1 1 Reserved
User
Permission
No access
No access
Read only
Reserved
No access
Read only
Read/write
Reserved
Table 6-3 Interpreting access permission (AP) bits
Notes
Any access generates a permission fault
Supervisor read only permitted
Any write generates a permission fault
Reserved
Access allowed only in Supervisor mode
Writes in User mode cause permission fault
All access types permitted in both modes
Reserved
6-10
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ARM DDI 0192A