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M30245 Group
USB frame number register
This register is used to contain 11-bit frame number of SOF token received from the host CPU. This is
the read-only register.
The configuration of USB frame number register is shown in Figure 2.8.24.
USB Frame Number register (Note)
(b15)
b7
0
0
0
0
0
Figure 2.8.24. USB frame number register
Rev.2.00 Oct 16, 2006
REJ09B0340-0200
(b8)
b0
b7
b0
page 153 of 354
Symbol
Address
USBFN
028A
Bit Symbol
Bit Name
SOF frame number bit
FN10-0
Reserved
Note: Read only.
2. USB function
When reset
0000
16
16
Function
11-bit frame number
issued with an SOF packet
"0" when read
R W
O X
O X
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