atmega32u4-16mu ATMEL Corporation, atmega32u4-16mu Datasheet - Page 277

• Manufacturer Part Number: atmega32u4-16mu
• Description: Atmega32u4 8-bit Avr Microcontroller With 32k Bytes Of Isp Flash And Usb Controller
• Manufacturer: ATMEL Corporation

7766A–AVR–03/08
Figure 22-8. USB Interrupt System
The USB hardware module distinguishes between USB General events and USB Endpoint
events that are relevant with data transfers relative to each endpoint.
Figure 22-9. USB General interrupt vector sources
Almost all these interrupts are time-relative events that will be detected only if the USB clock is
enabled (FRZCLK bit set), except for:
This asynchronous interrupts allow to wake-up a device that is in power-down mode, generally
after that the USB has entered the Suspend state.
• VBUS plug-in detection (insert, remove)
• WAKEUP interrupt that will trigger each time a state change is detected on the data lines.
USBINT.0
UPRSMI
UDINT.6
EORSMI
UDINT.5
WAKEUPI
UDINT.4
UDINT.3
UDINT.2
UDINT.0
VBUSTI
EORSTI
SUSPI
SOFI
Endpoint
Interrupt
USBCON.0
OTGIEN.0
UPRSME
EORSME
WAKEUPE
EORSTE
USB General
Interrupt
USB Device
VBUSTE
UDIEN.6
UDIEN.5
UDIEN.4
UDIEN.3
UDIEN.2
UDIEN.0
Interrupt
SUSPE
SOFE
Interrupt Vector
USB General
USB Device
Interrupt
Asynchronous Interrupt source
(allows the CPU to wake up from power down mode)
USB Endpoint/Pipe
Interrupt Vector
Interrupt Vector
USB General
ATmega32U4
Interrupt Vector
USB General
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