DOC7707 datasheet(189/307 Pages) ETC1

189 / 307 page

189

7707F–AVR–11/10

AT90USB82/162

Each of these interupts are time-relative events that will be detected only if the USB clock is

enabled (FRZCLK bit cleared), except for the WAKEUP interrupt that will trigger each time a

state change is detected on the data lines.

This asynchronous interrupt WAKEUP allows to wake-up a device that is in power-down mode,

generally after that the USB has entered the Suspend state.

Figure 19-10. 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 interrupt by reading the UEINT register, and then handle

the event detected by polling the different flags.

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 Endpoint

Interrupt Vector

DOC7707 Datasheet(PDF) 189 Page - List of Unclassifed Manufacturers

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