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99
Working with the CPU
Fault checking sequence
The sequence the MMU uses to check for access faults is different for sections and
pages. Figure 36 shows the sequence for both types of access.
0 0 1 0 Read only Read only
0 0 0 1 Read only Read only
0 0 1 1
UNPREDICTABLE UNPREDICTABLE
0 1 x x Read/write No access
1 0 x x Read/write Read only
1 1 x x Read/write Read/write
AP S R Privileged permissions User permissions
Table 42: Interpreting access permission (AP) bits