ATMEGA8U2-AUR Atmel, ATMEGA8U2-AUR Datasheet - Page 191

• 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: -

20.5
20.5.1
20.5.2
7799D–AVR–11/10
Power modes
Idle mode
Power-down
UESTAX.6
UESTAX.5
UEINTX.6
UEINTX.4
UEINTX.3
UEINTX.2
UEINTX.1
UEINTX.0
UNDERFI
NAKOUTI
RXOUTI
STALLEDI
OVERFI
RXSTPI
NAKINI
TXINI
Figure 20-10. USB Endpoint Interrupt vector sources
Each endpoint has 8 interrupts sources associated with flags, and each source can be enabled
to trigger the corresponding endpoint interrupt.
If, for an endpoint, at least one of the sources is enabled to trigger interrupt, the corresponding
event(s) will make the program branch to the USB Endpoint Interrupt vector. The user may
determine the source (endpoint) of the interrupt by reading the
Register” on page
In Idle mode, the CPU is halted (CPU clock stopped). The Idle mode is taken wether the USB
controller is running or not. The CPU can wake up on any USB interrupts.
In Power-down mode, the oscillator is stopped and halts all the clocks (CPU and peripherals).
The USB controller wakes up when:
• the WAKEUPI interrupt is triggered (single asynchronous interrupt)
UEIENX.7
UEIENX.6
UEIENX.4
UEIENX.3
UEIENX.2
UEIENX.1
UEIENX.0
RXOUTE
STALLEDE
TXOUTE
FLERRE
TXSTPE
NAKINE
TXINE
210.
UEINT.X
Endpoint 0
EPINT
Endpoint 1
Endpoint 2
Endpoint 3
Endpoint 4
ATmega8U2/16U2/32U2
“UDINT – USB Device Interrupt
Interrupt Vec
USB Endpoi
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