Datasheet

280
ATmega16U4/32U4 [DATASHEET]
Atmel-7766J-USB-ATmega16U4/32U4-Datasheet_04/2016
Figure 22-5. USB Device Controller Endpoint Interrupt System
Processing interrupts are generated when:
 Ready to accept IN data(EPINTx, TXINI=1)
 Received OUT data(EPINTx, RXOUTI=1)
 Received SETUP(EPINTx, RXSTPI=1)
Exception Interrupts are generated when:
 Stalled packet(EPINTx, STALLEDI=1)
 CRC error on OUT in isochronous mode(EPINTx, STALLEDI=1)
 Overflow in isochronous mode(EPINTx, OVERFI=1)
 Underflow in isochronous mode(EPINTx, UNDERFI=1)
 NAK IN sent(EPINTx, NAKINI=1)
 NAK OUT sent(EPINTx, NAKOUTI=1)
EPINT
UEINT.X
Endpoint 0
Endpoint 1
Endpoint 2
Endpoint 3
Endpoint 4
Endpoint 5
Endpoint Interrupt
Endpoint 6
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
TXINI
UEINTX.0
TXINE
UEIENX.0