ATMEGA8U2-AUR Atmel, ATMEGA8U2-AUR Datasheet - Page 208
ATMEGA8U2-AUR
Manufacturer Part Number
ATMEGA8U2-AUR
Description
MCU AVR 8K FLASH 16MHZ 32TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA8U2-AUR
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
SPI, UART/USART, USB
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
22
Program Memory Size
8KB (4K x 16)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
32-TQFP, 32-VQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Data Converters
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21.17 Interrupts
7799D–AVR–11/10
It is not possible to have overflow error during IN stage, in the CPU side, since the CPU should
write only if the bank is ready to access data (TXINI=1 or RWAL=1).
The next figure shows all the interrupts sources:
Figure 21-4. USB Device Controller Interrupt System
There are 2 kind of interrupts: processing (i.e. their generation are part of the normal processing)
and exception (errors).
Processing interrupts are generated when:
Exception Interrupts are generated when:
• Upstream resume( UPRSMI )
• End of resume( EORSMI )
• Wake up( WAKEUPI )
• End of reset (Speed Initialization)( EORSTI )
• Start of frame( SOFI , if FNCERR=0)
• Suspend detected after 3 ms of inactivity( SUSPI )
• CRC error in frame number of SOF( SOFI , FNCERR=1)
EORSMI
UPRSMI
UDINT.6
UDINT.5
WAKEUPI
UDINT.4
EORSTI
UDINT.3
UDINT.2
UDINT.0
SUSPI
SOFI
UPRSME
EORSME
UDIEN.6
UDIEN.5
WAKEUPE
UDIEN.4
EORSTE
UDIEN.3
UDIEN.2
UDIEN.0
SUSPE
SOFE
ATmega8U2/16U2/32U2
USB Device
Interrupt
208
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