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Section 26 USB 2.0 Host/Function Module
R01UH0134EJ0400 Rev. 4.00 Page 1409 of 2108
Sep 24, 2014
SH7262 Group, SH7264 Group
26.3.22 Frame Number Register (UFRMNUM)
UFRMNUM is a register that indicates the frame number.
This register is initialized by a power-on reset.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Bit:
Initial value:
R/W:
0000000000000000
RRRRRRRRRRRRRRRR
————————————— UFRNM[2:0]
Bit Bit Name
Initial
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 Frame
The frame number can be confirmed.
This module sets these bits to indicate the frame
number during high-speed operation.
During operation other than high-speed operation,
this module sets these bits to B'000.
Read these bits twice to check that the same value is
read.