Datasheet

250
7593L–AVR–09/12
AT90USB64/128
Figure 22-13. USB general and OTG controller interrupt system.
There are two kinds of interrupts: processing (that is, their generation are part of the normal pro-
cessing) and exception (errors).
Processing interrupts are generated when such events occur:
• USB ID Pad change detection (insert, remove)(IDTI)
• VBUS plug-in detection (insert, remove) (VBUSTI)
• SRP detected(SRPI)
• Role Exchanged(ROLEEXI)
Exception Interrupts are generated with the following events:
• Drop on VBus Detected(VBERRI)
• Error during the B-Connection(BCERRI)
• HNP Error(HNPERRI)
• Time-out detected during Suspend mode(STOII)
22.5 Power modes
22.5.1 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.
22.5.2 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 in the Peripheral mode (HOST cleared)
IDTE
USBCON.1
IDTI
USBINT.1
VBUSTI
USBINT.0
VBUSTE
USBCON.0
STOI
OTGINT.5
STOE
OTGIEN.5
HNPERRI
OTGINT.4
HNPERRE
OTGIEN.4
ROLEEXI
OTGINT.3
ROLEEXE
OTGIEN.3
BCERRI
OTGINT.2
BCERRE
OTGIEN.2
VBERRI
OTGINT.1
VBERRE
OTGIEN.1
SRPI
OTGINT.0
SRPE
OTGIEN.0
USB general & OTG
interrupt vector
Asynchronous interrupt source
(allows the CPU to wake up from power down mode