SAM9XE512 Atmel Corporation, SAM9XE512 Datasheet - Page 69

• Manufacturer Part Number: SAM9XE512
• Manufacturer: Atmel Corporation

Specifications of SAM9XE512

• Flash (kbytes): 512 Kbytes
• Pin Count: 217
• Max. Operating Frequency: 180 MHz
• Cpu: ARM926
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 96
• Ext Interrupts: 96
• Usb Transceiver: 3
• Usb Speed: Full Speed
• Usb Interface: Host, Device
• Spi: 2
• Twi (i2c): 2
• Uart: 6
• Ssc: 1
• Ethernet: 1
• Sd / Emmc: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: Yes
• Adc Channels: 4
• Adc Resolution (bits): 10
• Adc Speed (ksps): 312
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 32
• Self Program Memory: NO
• External Bus Interface: 1
• Dram Memory: sdram
• Nand Interface: Yes
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8/3.3
• Operating Voltage (vcc): 1.65 to 1.95
• Fpu: No
• Mpu / Mmu: No / Yes
• Timers: 6
• Output Compare Channels: 6
• Input Capture Channels: 6
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: No

2.9.12
ARM DDI 0165B
Exception priorities
When multiple exceptions arise at the same time, a fixed priority system determines the
order in which they are handled:
1.
2.
3.
4.
5.
6.
Some exceptions cannot occur together:
•
•
Data Abort.
FIQ.
Prefetch Abort.
Reset (highest priority).
IRQ.
BKPT, undefined instruction, and SWI (lowest priority).
The BKPT, or undefined instruction, and SWI exceptions are mutually exclusive.
Each corresponds to a particular (non-overlapping) decoding of the current
instruction.
When FIQs are enabled, and a Data Abort occurs at the same time as an FIQ, the
ARM9E-S enters the Data Abort handler, and proceeds immediately to the FIQ
vector.
A normal return from the FIQ causes the Data Abort handler to resume execution.
Data Aborts must have higher priority than FIQs to ensure that the transfer error
does not escape detection. You must add the time for this exception entry to the
worst-case FIQ latency calculations in a system that uses aborts to support virtual
memory.
The FIQ handler must not access any memory that can generate a Data Abort,
because the initial Data Abort exception condition is lost.
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Programmer’s Model
2-27