Datasheet

51
11011B–ATARM–21-Feb-12
SAM3N
10.4.3.14 Base Priority Mask Register
The BASEPRI register defines the minimum priority for exception processing. When BASEPRI is
set to a nonzero value, it prevents the activation of all exceptions with same or lower priority
level as the BASEPRI value. See the register summary in Table 10-2 on page 44 for its attri-
butes. The bit assignments are:
• 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 “Interrupt Priority Registers” on page 158 for more information. Remember
that higher priority field values correspond to lower exception priorities.
31 30 29 28 27 26 25 24
Reserved
23 22 21 20 19 18 17 16
Reserved
15 14 13 12 11 10 9 8
Reserved
76543210
BASEPRI