AT32UC3A464S Atmel Corporation, AT32UC3A464S Datasheet - Page 92

• Manufacturer Part Number: AT32UC3A464S
• Manufacturer: Atmel Corporation

Specifications of AT32UC3A464S

• Flash (kbytes): 64 Kbytes
• Pin Count: 100
• Max. Operating Frequency: 66 MHz
• Cpu: 32-bit AVR
• Hardware Qtouch Acquisition: No
• Usb Transceiver: 1
• Usb Speed: Hi-Speed
• Usb Interface: Device + OTG
• Spi: 6
• Twi (i2c): 2
• Uart: 4
• Ssc: 1
• Sd / Emmc: 2
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: AES
• Sram (kbytes): 128
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: Yes
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 3.0 to 3.6
• Operating Voltage (vcc): 3.0 to 3.6
• Fpu: No
• Mpu / Mmu: Yes / No
• Timers: 6
• Output Compare Channels: 6
• Input Capture Channels: 6
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

8.4
8.5
92
Event priority
Event handling in secure state
AVR32
Several instructions may be in the pipeline at the same time, and several events may be issued
in each pipeline stage. This implies that several pending exceptions may be in the pipeline
simultaneously. Priorities must therefore be imposed, ensuring that the correct event is serviced
first. The priority scheme obeys the following rules:
Details about the timing of events is IMPLEMENTATION DEFINED, and given in the hardware
manual for the specific implementation.
Interrupt and exception handling in AVR32A and AVR32B has been described in the previous
chapters. This behavior is modified in the following way when interrupts and exceptions are
received in secure state:
Note that in the secure state, all exception sources share the same handler address. It is there-
fore not possible to separate different exception causes when in the secure world. The secure
world system must be designed to support this, the most obvious solution is to design the secure
software so that exceptions will not arise.
1. If several instructions trigger events, the instruction furthest down the pipeline is ser-
2. If this instruction has several pending events, the event with the highest priority is ser-
• A sscall instruction will set SR[GM]. In secure state, SR[GM] masks both INT0-INT3, and
• sscall has handler address at offset 0x4 relative to the reset handler address.
• Exceptions have a handler address at offset 0x8 relative to the reset handler address.
• NMI has a handler address at offset 0xC relative to the reset handler address.
• BREAKPOINT has a handler address at offset 0x10 relative to the reset handler address.
• INT0-INT3 are not autovectored, but have a common handler address at offset 0x14 relative
NMI. Clearing SR[GM], INT0-INT3 and NMI will remove the mask of these event sources.
INT0-INT3 are still additionally masked by the I0M-I3M bits in the status register.
to the reset handler address.
viced first, even if upstream instructions have pending events of higher priority.
viced first. After this event has been serviced, all pending events are cleared and the
instruction is restarted.
32000D–04/2011