ATmega16U2 datasheet(191/314 Pages) ATMEL

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191

7799B–AVR–07/09

ATmega8U2/16U2/32U2

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 “UDINT – USB Device Interrupt

20.5

Power modes

20.5.1

Idle mode

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.

20.5.2

Power-down

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)

FLERRE

UEIENX.7

OVERFI

UESTAX.6

UNDERFI

UESTAX.5

NAKINI

UEINTX.6

NAKINE

UEIENX.6

NAKOUTI

UEINTX.4

TXSTPE

UEIENX.4

RXSTPI

UEINTX.3

TXOUTE

UEIENX.3

RXOUTI

UEINTX.2

RXOUTE

UEIENX.2

STALLEDI

UEINTX.1

STALLEDE

UEIENX.1

EPINT

UEINT.X

Endpoint 0

Endpoint 1

Endpoint 2

Endpoint 3

Endpoint 4

TXINI

UEINTX.0

TXINE

UEIENX.0

USB Endpoi

Interrupt Vec

ATmega16U2 Datasheet(PDF) 191 Page - ATMEL Corporation

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