Datasheet

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SAM3X / SAM3A [DATASHEET]
Atmel-11057C-ATARM-SAM3X-SAM3A-Datasheet_23-Mar-15
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 51 for its attributes. 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 160 for more information. Remem-
ber that higher priority field values correspond to lower exception priorities.
31 302928 27 26 25 24
Reserved
23 22 21 20 19 18 17 16
Reserved
15 14 13 12 11 10 9 8
Reserved
76543 210
BASEPRI