AT43USB320A_04 ATMEL [ATMEL Corporation], AT43USB320A_04 Datasheet - Page 31

• Manufacturer Part Number: AT43USB320A_04
• Description: Full-speed USB Microcontroller with an Embedded Hub
• Manufacturer: ATMEL [ATMEL Corporation]

USB Interrupt
Sources
1443E–USB–4/04
The USB interrupts are described below.
Table 10. USB Interrupt Sources
All interrupts have individual enable, status, and mask bits through the interrupt enable regis-
ter and interrupt mask register. The Suspend and Resume interrupts are cleared by writing a 0
to the particular interrupt bit. All other interrupts are cleared when the microcontroller sets a bit
in an interrupt acknowledge register.
Interrupt
SOF Received
EOF2
Function EP0 Interrupt
Function EP1 Interrupt
Function EP2 Interrupt
Hub EP0 Interrupt
FRWUP
GLB SUSP
RSM
Description
Whenever USB hardware decodes a valid Start of Frame. The
frame number is stored in the two Frame Number Registers.
Activated whenever the hub's frame timer reaches its EOF2 time
point.
See “Control Transfers at Control Endpoint EP0” on page 70 for
details.
For an OUT endpoint it indicates that Function Endpoint 1 has
received a valid OUT packet and that the data is in the FIFO. For
an IN endpoint it means that the endpoint has received an IN
token, sent out the data in the FIFO and received an ACK from the
Host. The FIFO is now ready to be written by new data from the
microcontroller.
For an OUT endpoint it indicates that Function Endpoint 2 has
received a valid OUT packet and that the data is in the FIFO. For
an IN endpoint it means that the endpoint has received an IN
token, sent out the data in the FIFO and received an ACK from the
Host. The FIFO is now ready to be written by new data from the
microcontroller.
See “Control Transfers at Control Endpoint EP0” on page 70 for
details.
USB hardware has received a embedded function remote wakeup
request.
USB hardware has received global suspend signaling and is
preparing to put the hub in the suspend mode. The
microcontroller's firmware should place the embedded function in
the suspend state.
USB hardware received resume signaling and is propagating the
resume signaling. The microcontroller's firmware should take the
embedded function out of the suspended state.
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