SAM7X512 Atmel Corporation, SAM7X512 Datasheet - Page 68

• Manufacturer Part Number: SAM7X512
• Manufacturer: Atmel Corporation

Specifications of SAM7X512

• Flash (kbytes): 512 Kbytes
• Pin Count: 100
• Max. Operating Frequency: 55 MHz
• Cpu: ARM7TDMI
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 62
• Ext Interrupts: 62
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 2
• Twi (i2c): 1
• Uart: 3
• Can: 1
• Ssc: 1
• Ethernet: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 384
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 128
• Self Program Memory: NO
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 3.3
• Operating Voltage (vcc): 3.0 to 3.6
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 3
• Output Compare Channels: 3
• Input Capture Channels: 3
• Pwm Channels: 4
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: No

Programmer’s Model
2.8.10
2-22
Exception priorities
Address
When multiple exceptions arise at the same time, a fixed priority system determines the
order in which they are handled. The priority order is listed in Table 2-5.
Some exceptions cannot occur together:
•
•
The 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
ARM7TDMI processor 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.
Exception
Data Abort
Reserved
IRQ
FIQ
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Mode on entry
Abort
Reserved
IRQ
FIQ
Priority
Highest
Lowest
Table 2-4 Exception vectors (continued)
I state on entry
Set
-
Set
Set
Table 2-5 Exception priority order
Exception
Reset
Data Abort
FIQ
IRQ
Prefetch Abort
Undefined instruction and SWI
F state on entry
Unchanged
-
Unchanged
Set
ARM DDI 0029G