Datasheet

293
7593L–AVR–09/12
AT90USB64/128
• 7 - Reserved
The value read from these bits is always 0. Do not set these bits.
• 6 - HWUPI - Host Wake-Up Interrupt
Set by hardware when a non-idle state is detected on the USB bus.This interrupt should be
enable only to wake up the CPU core from power down mode.
Shall be clear by software to acknowledge the interrupt. Setting by software has no effect.
• 5 - HSOFI - Host Start Of Frame Interrupt
Set by hardware when a SOF is issued by the Host controller. This triggers a USB interrupt
when HSOFE is set. When using the host controller in low speed mode, this bit is also set when
a keep-alive is sent.
Shall be cleared by software to acknowledge the interrupt. Setting by software has no effect.
• 4 - RXRSMI - Upstream Resume Received Interrupt
Set by hardware when an Upstream Resume has been received from the Device.
Shall be cleared by software. Setting by software has no effect.
• 3 - RSMEDI - Downstream Resume Sent Interrupt
Set by hardware when a Downstream Resume has been sent to the Device.
Shall be cleared by software. Setting by software has no effect.
• 2 - RSTI - USB Reset Sent Interrupt
Set by hardware when a USB Reset has been sent to the Device.
Shall be cleared by software. Setting by software has no effect.
• 1 - DDISCI - Device Disconnection Interrupt
Set by hardware when the device has been remov
ed from the USB bus.
Shall be cleared by software. Setting by software has no effect.
• 0 - DCONNI - Device Connection Interrupt
Set by hardware when a new device has been connected to the USB bus.
Shall be cleared by software. Setting by software has no effect.
• 7 - Reserved
The value read from these bits is always 0. Do not set these bits.
Bit 76543210
- HWUPI HSOFI RXRSMI RSMEDI RSTI DDISCI DCONNI UHINT
Read/write R R/W R/W R/W R/W R/W R/W R/W
Initial value00000000
Bit 7654 321 0
HWUPE HSOFE RXRSME RSMEDE RSTE DDISCE DCONNE UHIEN
Read/write R R/W R/W R/W R/W R/W R/W R/W
Initial value 0 0 0 0 0 0 0 0