Universal serial bus full-speed host/device interface (USB) RM0444
1290/1390 RM0444 Rev 5
USB Device address (USB_DADDR)
Address offset: 0x4C
Reset value: 0x0000 0000
Bit 13 LCK: Locked
– Device mode
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
– Device mode
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.
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res.
1514131211109876543210
Res. Res. Res. Res. Res. Res. Res. Res. EF ADD[6:0]
rw rw rw rw rw rw rw rw
Bits 31:8 Reserved, must be kept at reset value.
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_CHEPnR registers.
Bits 6:0 ADD[6:0]: Device address
– Device mode
These bits contain the USB function address assigned by the host PC during the
enumeration process. Both this field and the endpoint/channel address (EA) field in the
associated USB_CHEPnR register must match with the information contained in a USB
token in order to handle a transaction to the required endpoint.
– Host mode
These bits contain the address transmitted with the LPM transaction
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