STR720 datasheet(288/401 Pages) STMICROELECTRONICS

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STR720 - USB SLAVE INTERFACE (USB)

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USB Frame Number Register (USB_FNR)

Address Offset: 48h

Reset Value: 0000 0xxx xxxx xxxx (0xxxh)

54321

LSOF[1:0]

FN[10:0]

Bit 15

RXDP Receive Data + Line Status

This bit can be used to observe the status of received data plus upstream

port data line. It can be used during end-of-suspend routines to help

determining the wake-up event.

Bit 14

RXDM. Receive Data - Line Status

This bit can be used to observe the status of received data minus

upstream port data line. It can be used during end-of-suspend routines to

help determining the wake-up event.

Bit 13

LCK: Locked

This bit is set by the hardware when at least two consecutive SOF packets

have been received after the end of an USB reset condition or after the

end of an USB resume sequence. Once locked, the frame timer remains

in this state until an USB reset or USB suspend event occurs.

Bits12:11

LSOF[1:0]: Lost SOF

These bits are written by the hardware when an ESOF interrupt is

generated, counting the number of consecutive SOF packets lost. At the

reception of an SOF packet, these bits are cleared.

Bits 10:0

FN[10:0]: Frame Number

This bit field contains the 11-bits frame number contained in the last

received SOF packet. The frame number is incremented for every frame

sent by the host and it is useful for Isochronous transfers. This bit field is

updated on the generation of an SOF interrupt.

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