AT43USB353M-AC datasheet(26/95 Pages) ATMEL

26 / 95 page

AT43USB353M

3307B–USB–4/04

USB Interrupt

Sources

The USB interrupts are described below.

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.

USB End-point

Interrupt Sources

An assertion or activation of one or more bits in the end-point's Control and Status Register

triggers the end-point interrupts. These triggers are different for control and non-control end-

points as described in Table 12. Please refer to the Control and Status Register for more

information.

Table 11. 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 58 for details.

Function EP1 Interrupt

For an OUT end-point it indicates that Function End-point 1 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.

Function EP2 Interrupt

For an OUT end-point it indicates that Function End-point 2 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.

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 58 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.

AT43USB353M-AC датащи(PDF) 26 Page - ATMEL Corporation

AT43USB353M-AC датащи(HTML) 26 Page - ATMEL Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95

датащи скачать

ссылки URL