SH7670 Datasheet, PDF (720/1292 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7670 Series

Section 17 USB 2.0 Host/Function Module (USB)
Initial
Bit
Bit Name
Value R/W
14
CRCE
0
R/W*
13 to 11 
All 0
R
10 to 0 FRNM[10:0] H'000 R
Note: * Only 0 can be written to
Description
Receive Data Error
Indicates whether a CRC error or bit stuffing error
has been detected in the pipe during isochronous
transfer.
0: No error
1: An error occurred
Software can clear this bit to 0 by writing 0 to the bit.
Here, 1 should be written to the other bits in this
register.
(1) When the host controller function is selected
On detecting a CRC error, this module generates
the internal NRDY interrupt request.
(2) When the function controller function is selected
On detecting a CRC error, this module does not
generate the internal NRDY interrupt request.
Reserved
These bits are always read as 0. The write value
should always be 0.
Frame Number
This module sets these bits to indicate the latest
frame number, which is updated every time an SOF
packet is issued or received (every 1 ms)
Repeat reading these bits until the same value is
read twice.
Rev. 1.00 Nov. 14, 2007 Page 694 of 1262
REJ09B0437-0100