ATxmega256A3U Atmel Corporation, ATxmega256A3U Datasheet - Page 137

• Manufacturer Part Number: ATxmega256A3U
• Manufacturer: Atmel Corporation

Specifications of ATxmega256A3U

• Flash (kbytes): 256 Kbytes
• Pin Count: 64
• Max. Operating Frequency: 32 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 50
• Ext Interrupts: 50
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 10
• Twi (i2c): 2
• Uart: 7
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 16
• Adc Resolution (bits): 12
• Adc Speed (ksps): 2000
• Analog Comparators: 4
• Resistive Touch Screen: No
• Dac Channels: 2
• Dac Resolution (bits): 12
• Temp. Sensor: Yes
• Crypto Engine: AES/DES
• Sram (kbytes): 16
• Eeprom (bytes): 4096
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: Yes
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.6 to 3.6
• Operating Voltage (vcc): 1.6 to 3.6
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 7
• Output Compare Channels: 22
• Input Capture Channels: 22
• Pwm Channels: 22
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

12.7
12.8
12.8.1
12.8.2
8331A–AVR–07/11
Moving Interrupts Between Application and Boot Sections
Register Description
STATUS – PMIC Status Register
INTPRI – PMIC Priority Register
The interrupt vectors can be moved from the default location in the application section in flash to
the start of the boot section.
• Bit 7 – NMIEX: Non-Maskable Interrupt Executing
This flag is set if a non-maskable interrupt is executing. The flag will be cleared when returning
(RETI) from the interrupt handler.
• Bit 6:3 – Reserved
These bits are reserved and will always be read as zero. For compatibility with future devices,
always write these bits to zero when this register is written.
• Bit 2 – HILVLEX: High-level Interrupt Executing
This flag is set when a high-level interrupt is executing or when the interrupt handler has been
interrupted by an NMI. The flag will be cleared when returning (RETI) from the interrupt handler.
• Bit 1 – MEDLVLEX: Medium-level Interrupt Executing
This flag is set when a medium-level interrupt is executing or when the interrupt handler has
been interrupted by an interrupt from higher level or an NMI. The flag will be cleared when
returning (RETI) from the interrupt handler.
• Bit 0 – LOLVLEX: Low-level Interrupt Executing
This flag is set when a low-level interrupt is executing or when the interrupt handler has been
interrupted by an interrupt from higher level or an NMI. The flag will be cleared when returning
(RETI) from the interrupt handler.
• Bit 7:0 – INTPRI: Interrupt Priority
When round-robin scheduling is enabled, this register stores the interrupt vector of the last
acknowledged low-level interrupt. The stored interrupt vector will have the lowest priority the
next time one or more low-level interrupts are pending. The register is accessible from software
Bit
+0x01
Read/Write
Initial Value
Bit
+0x00
Read/Write
Initial Value
NMIEX
R/W
R
7
0
7
0
R/W
R
6
–
0
6
0
R/W
R
5
–
0
5
0
R/W
R
4
–
0
4
0
INTPRI[7:0]
Atmel AVR XMEGA AU
R/W
R
3
–
0
3
0
HILVLEX
R/W
R
2
0
2
0
MEDLVLEX
R/W
R
1
0
1
0
LOLVLEX
R/W
R
0
0
0
0
STATUS
INTPRI
137