AT43USB325 datasheet(31/109 Pages) ATMEL

31 / 109 page

3355C–USB–4/05

AT43USB325

4.12

USB Interrupt Sources

The USB interrupts are described below.

All interrupts have individual enable, status, and mask bits through the interrupt enable register

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.

Table 4-3.

USB Interrupt Sources

Interrupt

Description

SOF Received

Whenever USB hardware decodes a valid Start of Frame. The

frame number is stored in the two Frame Number Registers.

EOF2

Activated whenever the hub's frame timer reaches its EOF2 time

point.

Function EP0 Interrupt

See “Control Transfers at Control End-point EP0” on page 64 for

details.

Function EP1 Interrupt

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.

Function EP2 Interrupt

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.

Function EP3 Interrupt

For an OUT end-point it indicates that Function End-point 3 has

received a valid OUT packet and that the data is in the FIFO. For

an IN end-point it means that the end-point 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.

Hub EP0 Interrupt

See “Control Transfers at Control End-point EP0” on page 64 for

details.

FRWUP

USB hardware has received a embedded function remote wakeup

request.

GLB SUSP

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.

RSM

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.

BUS RESET

USB hardware received a USB bus reset. This applies only in

cases where a separation between USB bus reset and

microcontroller reset is required. Be very careful when using this

feature.

AT43USB325 Datasheet(PDF) 31 Page - ATMEL Corporation

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