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CHAPTER 17 USB FUNCTION
■ ST4
Figure 17.2-11 shows the ST4 register.
The address of the ST4 register is 0006_006C
Address:0006-006C
Table 17.2-4 lists the bits of the ST4 register and their functions.
Table 17.2-4 Bits of the ST4 Register
Bit name
FMR[10:0]
390
Figure 17.2-11 ST4 Register
15
14
13
12
11
H
Polarity
These bits indicate the frame number of the latest
frame received by USB transfer.
-
The received-frame number is extracted from an
SOF packet.
.
H
10
9
8
7
6
5
F
F
F
F
F
F
M
M
M
M
M
M
R
R
R
R
R
R
10
9
8
7
6
5
R
R
R
R
R
R
Function
4
3
2
1
0
F
F
F
F
F
M
M
M
M
M
XXXXX00000000000
R
R
R
R
R
4
3
2
1
0
R
R
R
R
R
Initial value
B
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