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ARM720T Datasheet(PDF) 92 Page - List of Unclassifed Manufacturers

Part # ARM720T
Description  General-purpose 32-bit Microprocessor with 8KB cache, enlarged Write buffer, and Memory Management Unit (MMU) combined in a single chip
PDF  242 Pages
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Manufacturer  ETC2 [List of Unclassifed Manufacturers]
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ARM720T Datasheet(HTML) 92 Page - List of Unclassifed Manufacturers

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Memory Management Unit
6-10
Copyright © ARM Limited 1997, 1998, 2000. All rights reserved.
ARM DDI 0192A
Table 6-3 Interpreting access permission (AP) bits
AP
S
R
Supervisor
Permission
User
Permission
Notes
00
0
0
No access
No access
Any access generates a permission fault
00
1
0
Read only
No access
Supervisor read only permitted
00
0
1
Read only
Read only
Any write generates a permission fault
00
1
1
Reserved
Reserved
Reserved
01
x
x
Read/write
No access
Access allowed only in Supervisor mode
10
x
x
Read/write
Read only
Writes in User mode cause permission fault
11
x
x
Read/write
Read/write
All access types permitted in both modes
xx
1
1
Reserved
Reserved
Reserved



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