ATSAM3X4EA-AU Atmel, ATSAM3X4EA-AU Datasheet - Page 177
ATSAM3X4EA-AU
Manufacturer Part Number
ATSAM3X4EA-AU
Description
ARM Microcontrollers - MCU QFP144,GREEN, IND TEMP, MRL A
Manufacturer
Atmel
Datasheet
1.ATSAM3X8EA-AU.pdf
(1467 pages)
Specifications of ATSAM3X4EA-AU
Rohs
yes
Core
ARM Cortex M3
Processor Series
SAM3X
Data Bus Width
32 bit
Maximum Clock Frequency
84 MHz
Program Memory Size
256 KB
Data Ram Size
64 KB
On-chip Adc
Yes
Operating Supply Voltage
2.4 V to 3.6 V
Operating Temperature Range
- 40 C to +85 C
Package / Case
LQFP-144
Mounting Style
SMD/SMT
Factory Pack Quantity
60
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• 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.
12.21.6.1
11057B–ATARM–28-May-12
11057B–ATARM–28-May-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 12-31. 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
84.
(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 12-31
SAM3X/A
SAM3X/A
“Interrupt priority
Subpriorities
1
2
4
8
16
shows
177
177
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