ATmega16U4 datasheet(260/408 Pages) ATMEL

260 / 408 page

260

7766D–AVR–01/09

ATmega16U4/ATmega32U4

Figure 21-10. USB Endpoint Interrupt vector sources

Each endpoint has 8 interrupts sources associated with flags, and each source can be enabled

or not 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 inter-

rupt by reading the UEINT register, and then handle the event detected by polling the different

flags.

21.5

Power modes

21.5.1

Idle mode

In this mode, the CPU core is halted (CPU clock stopped). The Idle mode is taken wether the

USB controller is running or not. The CPU “wakes up” on any USB interrupts.

21.5.2

Power down

In this mode, the oscillator is stopped and halts all the clocks (CPU and peripherals). The USB

controller “wakes up” when:

• the WAKEUPI interrupt is triggered

• the VBUSTI interrupt is triggered

FLERRE

UEIENX.7

OVERFI

UESTAX.6

UNDERFI

UESTAX.5

NAKINI

UEINTX.6

NAKINE

UEIENX.6

NAKOUTI

UEINTX.4

TXSTPE

UEIENX.4

RXSTPI

UEINTX.3

RXSTPE

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

Endpoint 5

TXINI

UEINTX.0

TXINE

UEIENX.0

USB Endpoint

Interrupt Vector

Endpoint 6

ATmega16U4 Datasheet(PDF) 260 Page - ATMEL Corporation

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