SAM3X8E Atmel Corporation, SAM3X8E Datasheet - Page 173

• Manufacturer Part Number: SAM3X8E
• Manufacturer: Atmel Corporation

• VECTCLRACTIVE
WO
Reserved for Debug use. This bit reads as 0. When writing to the register you must write 0 to this bit, otherwise behavior is
Unpredictable.
• VECTRESET
WO
Reserved for Debug use. This bit reads as 0. When writing to the register you must write 0 to this bit, otherwise behavior is
Unpredictable.
11.21.6.1
11057A–ATARM–17-Feb-12
11057A–ATARM–17-Feb-12
Binary point
The PRIGROUP field indicates the position of the binary point that splits the PRI_n fields in the
Interrupt Priority Registers into separate group priority and subpriority fields.
how the PRIGROUP value controls this split.
Table 11-31. Priority grouping
1.
Determining preemption of an exception uses only the group priority field, see
grouping” on page
PRIGROUP
b011
b100
b101
b110
b111
PRI_n[7:0] field showing the binary point. x denotes a group priority field bit, and y denotes a sub-
priority field bit.
Interrupt priority level value, PRI_N[7:0]
Binary
point
bxxxx.0000
bxxx.y0000
bxx.yy0000
bx.yyy0000
b.yyyy0000
80.
(1)
Group priority
bits
[7:4]
[7:5]
[7:6]
[7]
None
Subpriority
bits
None
[4]
[5:4]
[6:4]
[7:4]
16
8
4
2
1
Number of
Group
priorities
Table 11-31
SAM3X/A
SAM3X/A
“Interrupt priority
Subpriorities
1
2
4
8
16
shows
173
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