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RM0008
Universal serial bus full-speed device interface (USB)
USB frame number register (USB_FNR)
Address offset: 0x48
Reset value: 0x0XXX where X is undefined
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
RXDP
RXDM
LCK
LSOF[1:0]
FN[10:0]
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
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 wakeup 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 wakeup 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.
Bits 12:11 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.
USB device address (USB_DADDR)
Address offset: 0x4C
Reset value: 0x0000
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Reserved
Res.
EF
rw
ADD6
rw
ADD5
rw
ADD4
rw
ADD3
rw
ADD2
rw
ADD1
rw
ADD0
rw
Bits 15:8 Reserved
Bit 7 EF: Enable function
This bit is set by the software to enable the USB device. The address of this device is
contained in the following ADD[6:0] bits. If this bit is at ‘0’ no transactions are handled,
irrespective of the settings of USB_EPnR registers.
Doc ID 13902 Rev 9
531/995
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