Datasheet

SAM4S Series [DATASHEET]

11100F–ATARM–29-Jan-14

12.4.1.15 Base 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.

• 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” for more information. Remember that higher priority

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

–

76543210

BASEPRI