ATSAM3U4CA-CU Atmel, ATSAM3U4CA-CU Datasheet - Page 188

• Manufacturer Part Number: ATSAM3U4CA-CU
• Description: IC MCU 32BIT 256KB FLSH 100TFBGA
• Manufacturer: Atmel
• Series: SAM3Ur

Specifications of ATSAM3U4CA-CU

• Core Processor: ARM® Cortex-M3™
• Core Size: 32-Bit
• Speed: 96MHz
• Connectivity: EBI/EMI, I²C, MMC, SPI, SSC, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, DMA, I²S, POR, PWM, WDT
• Number Of I /o: 57
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 52K x 8
• Voltage - Supply (vcc/vdd): 1.65 V ~ 1.95 V
• Data Converters: A/D 4x10b, 4x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-TFBGA
• Processor Series: ATSAM3x
• Core: ARM Cortex M3
• Data Bus Width: 32 bit
• Data Ram Size: 52 KB
• Interface Type: 3xUSART, TWI, 4xSPI, Bus
• Maximum Clock Frequency: 96 MHz
• Number Of Programmable I/os: 57
• Number Of Timers: 8
• Operating Supply Voltage: 1.62 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: JTRACE-CM3, MDK-ARM, RL-ARM, ULINK2
• Development Tools By Supplier: ATSAM3U-EK
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

• 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.
13.20.6.1
188
SAM3U Series
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 13-31. 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]
Number of
Group
priorities
16
8
4
2
1
6430D–ATARM–25-Mar-11
Table 13-31
“Interrupt priority
Subpriorities
1
2
4
8
16
shows