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ATSAM4S-XPLD
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SAM4S [DATASHEET]
11100E–ATARM–24-Jul-13
12.9.1.8 System Handler Priority Registers
The SCB_SHPR1-SCB_SHPR3 registers set the priority level, 0 to 15 of the exception handlers that have configurable priority.
They are byte-accessible.
They are byte-accessible.
The system fault handlers and the priority field and register for each handler are:
Each PRI_N field is 8 bits wide, but the processor implements only bits [7:4] of each field, and bits [3:0] read as zero and ignore
writes.
writes.
12.9.1.9 System Handler Priority Register 1
Name:
SCB_SHPR1
Access: Read-write
Reset: 0x000000000
• PRI_6: Priority
Priority of system handler 6, UsageFault.
• PRI_5: Priority
Priority of system handler 5, BusFault.
• PRI_4: Priority
Priority of system handler 4, MemManage.
Table 12-33. System Fault Handler Priority Fields
Handler
Field
Register Description
Memory management fault (MemManage)
PRI_4
Bus fault (BusFault)
PRI_5
Usage fault (UsageFault)
PRI_6
SVCall
PRI_11
PendSV
PRI_14
SysTick
PRI_15
31
30
29
28
27
26
25
24
–
23
22
21
20
19
18
17
16
PRI_6
15
14
13
12
11
10
9
8
PRI_5
7
6
5
4
3
2
1
0
PRI_4