Universal Serial Bus Device
17.2.2.9 Frame Number Registers (FRAMEx)
The FRAMEx registers store the current USB bus frame number. The frame number com-
prises 11 bits. FRAME1 holds the lower eight bits and FRAME2 holds the upper three bits.
BIT
FIELD
RESET
TYPE
BIT
FIELD
RESET
TYPE
ADDR
BIT
FIELD
RESET
TYPE
BIT
FIELD
RESET
TYPE
ADDR
BIT
31:8
7:0
BIT
31:3
2:0
17-18
Table 17-20. FRAME1 Register
31
30
29
28
27
0
0
0
0
0
RO
RO
RO
RO
RO
15
14
13
12
11
///
0
0
0
0
0
RO
RO
RO
RO
RO
Table 17-21. FRAME2 Register
31
30
29
28
27
0
0
0
0
0
RO
RO
RO
RO
RO
15
14
13
12
11
0
0
0
0
0
RO
RO
RO
RO
RO
Table 17-22. FRAME1 Fields
FIELD
///
FRAME1
Table 17-23. FRAME2 Fields
FIELD
///
Reserved Reading returns 0. Write the reset value.
FRAME2
Frame 2 Most significant 3 bits of USB Frame Number
Version 1.0
26
25
24
23
///
0
0
0
0
RO
RO
RO
RO
10
9
8
7
0
0
0
0
RO
RO
RO
RO
0xFFFF5000 + 0x030
26
25
24
23
///
0
0
0
0
RO
RO
RO
RO
10
9
8
7
///
0
0
0
0
RO
RO
RO
RO
0xFFFF5000 + 0x034
DESCRIPTION
Reserved Reading returns 0. Write the reset value.
Frame 1 Least significant 8 bits of USB Frame Number.
DESCRIPTION
LH79524/LH79525 User's Guide
22
21
20
19
18
0
0
0
0
0
RO
RO
RO
RO
RO
6
5
4
3
2
FRAME1
0
0
0
0
0
RO
RO
RO
RO
RO
22
21
20
19
18
0
0
0
0
0
RO
RO
RO
RO
RO
6
5
4
3
2
0
0
0
0
0
RO
RO
RO
RO
RO
17
16
0
0
RO
RO
1
0
0
0
RO
RO
17
16
0
0
RO
RO
1
0
FRAME2
0
0
RO
RO