ATSAM3U2EA-AU Atmel, ATSAM3U2EA-AU Datasheet - Page 86
![IC MCU 32BIT 128KB FLASH 144LQFP](/photos/6/72/67244/144l1-lqfp_sml.jpg)
ATSAM3U2EA-AU
Manufacturer Part Number
ATSAM3U2EA-AU
Description
IC MCU 32BIT 128KB FLASH 144LQFP
Manufacturer
Atmel
Series
SAM3Ur
Specifications of ATSAM3U2EA-AU
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
96
Program Memory Size
128KB (128K x 8)
Program Memory Type
FLASH
Ram Size
36K x 8
Voltage - Supply (vcc/vdd)
1.65 V ~ 1.95 V
Data Converters
A/D 8x10b, 8x12b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
144-LQFP
Controller Family/series
SAM3U
No. Of I/o's
96
Ram Memory Size
36KB
Cpu Speed
96MHz
No. Of Timers
3
Rohs Compliant
Yes
Processor Series
ATSAM3x
Core
ARM Cortex M3
Data Bus Width
32 bit
Data Ram Size
36 KB
Interface Type
4xUSART, 2xTWI, 5xSPI, Bus
Maximum Clock Frequency
96 MHz
Number Of Programmable I/os
96
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
Details
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
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13.5.7.6
13.6
86
Fault handling
SAM3U Series
Exception return
If no higher priority exception occurs during exception entry, the processor starts executing the
exception handler and automatically changes the status of the corresponding pending interrupt
to active.
If another higher priority exception occurs during exception entry, the processor starts executing
the exception handler for this exception and does not change the pending status of the earlier
exception. This is the late arrival case.
Exception return occurs when the processor is in Handler mode and executes one of the follow-
ing instructions to load the EXC_RETURN value into the PC:
EXC_RETURN is the value loaded into the LR on exception entry. The exception mechanism
relies on this value to detect when the processor has completed an exception handler. The low-
est four bits of this value provide information on the return stack and processor mode.
10
The processor sets EXC_RETURN bits[31:4] to
it indicates to the processor that the exception is complete, and the processor initiates the
exception return sequence.
Table 13-10. Exception return behavior
Faults are a subset of the exceptions, see
ate a fault:
EXC_RETURN[3:0]
bXXX0
b0001
b0011
b01X1
b1001
b1101
b1X11
• a
• a
• an
shows the EXC_RETURN[3:0] values with a description of the exception return behavior.
POP
BX
– a bus error on:
– an instruction fetch or vector table load
– a data access
LDR
instruction with any register.
instruction that includes the PC
or
LDM
instruction with the PC as the destination.
Description
Reserved.
Return to Handler mode.
Exception return gets state from MSP.
Execution uses MSP after return.
Reserved.
Reserved.
Return to Thread mode.
Exception return gets state from MSP.
Execution uses MSP after return.
Return to Thread mode.
Exception return gets state from PSP.
Execution uses PSP after return.
Reserved.
“Exception model” on page
0xFFFFFFF
. When this value is loaded into the PC
79. The following gener-
6430D–ATARM–25-Mar-11
Table 13-
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