SH7764 Datasheet, PDF (928/1752 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC Engine Family SH-4A Series

Section 21 USB 2.0 Host/Function Module (USB)
21.3.22 µFrame Number Register (UFRMNUM)
UFRMNUM is a register that indicates the µframe number.
This register is initialized by a power-on reset.
Bit: 15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
—
—
—
—
—
—
—
—
—
—
—
—
—
UFRNM[2:0]
Initial value: 0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
R/W: R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
Initial
Bit
Bit Name
Value R/W Description
15 to 3 
All 0
R
Reserved
These bits are always read as 0. The write value
should always be 0.
2 to 0 UFRNM[2:0] 000
R
µFrame
The µframe number can be confirmed.
This module sets these bits to indicate the µframe
number during high-speed operation.
During operation other than high-speed operation,
this module sets these bits to B'000.
Repeat reading these bits until the same value is
read twice.
Rev. 1.00 Nov. 22, 2007 Page 872 of 1692
REJ09B0360-0100