Atmel SAM4S-XPLD Atmel ATSAM4S-XPLD ATSAM4S-XPLD Data Sheet
Product codes
ATSAM4S-XPLD
58
SAM4S [DATASHEET]
11100E–ATARM–24-Jul-13
12.4.1.15Base Priority Mask Register
Name:
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.
vents the activation of all exceptions with same or lower priority level as the BASEPRI value.
• BASEPRI
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