NUC920ABN Datasheet, PDF (196/529 Pages) Nuvoton Technology Corporation – 32-BIT ARM926EJ-S BASED MCU

NUC920ABN
32-BIT ARM926EJ-S BASED MCU
USB Frame Index Register (UFINDR)
Register
Address
R/W Description
UFINDR ^0xB000_502C
R/W USB Frame Index Register
Reset Value
0x0000_0000
31
30
29
28
27
26
25
24
Reserved
23
22
21
20
19
18
17
16
Reserved
15
14
13
12
11
10
9
8
Reserved
FrameIND
7
6
5
4
3
2
1
0
FrameIND
Bits
[31:14]
[13:0]
Descriptions
Reserved
FrameIND
Frame Index
The value in this register increment at the end of each time frame (e.g.
micro-frame). Bits [N: 3] are used for the Frame List current index. This
means that each location of the frame list is accessed 8 times (frames or
micro-frames) before moving to the next index. The following illustrates
values of N based on the value of the Frame List Size field in the USBCMD
register.
Publication Release Date: Jun. 18, 2010
196
Revision: A3