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 58

SAM4S [DATASHEET]

11100E–ATARM–24-Jul-13

BASEPRI

Access: Read-write

Reset: 0x000000000 

The BASEPRI register defines the minimum priority for exception processing. When BASEPRI is set to a nonzero value, it pre-
vents the activation of all exceptions with same or lower priority level as the BASEPRI value. 

Priority mask bits:

0x0000 = No effect.

Nonzero = Defines the base priority for exception processing.

The processor does not process any exception with a priority value greater than or equal to BASEPRI.

This field is similar to the priority fields in the interrupt priority registers. The processor implements only bits[7:

4

] of this field, 

bits[

3

:0] read as zero and ignore writes. See 

field values correspond to lower exception priorities.

31

30

29

28

27

26

25

24

–

23

22

21

20

19

18

17

16

–

15

14

13

12

11

10

9

8

–

7

6

5

4

3

2

1

0

BASEPRI