SH7205 Datasheet, PDF (1189/1904 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7200 Series

Section 24 USB 2.0 Host/Function Module (USB)
Bit
Bit Name
14
REW
13, 12 
11, 10 MBW[1:0]
Initial
Value
0
R/W
R/W*
Undefined R
00
R/W
Description
Buffer Pointer Rewind
Set this bit to 1 to rewind the buffer pointer.
When the selected pipe is in the receiving direction,
setting this bit to 1 while the FIFO buffer is being
read allows re-reading the FIFO buffer from the first
data (in double buffer mode, re-reading the currently-
read FIFO buffer plane from the first data is allowed).
0: The buffer pointer is not rewound.
1: The buffer pointer is rewound.
Note: Do not set REW to 1 simultaneously with
modifying the CURPIPE bits. Before setting
REW to 1, ensure that FRDY is 1.
To re-write to the FIFO buffer from the first data
for the pipe in the transmitting direction, use the
BCLR bit.
Reserved
Undefined values are read from these bits. The write
value should always be 0.
FIFO Port Access Bit Width
Specifies the bit width for accessing the CFIFO port.
00: 8-bit width
01: 16-bit width
10: 32-bit width
11: Setting prohibited
Once reading of data from the buffer memory is
started, the FIFO port access bit width cannot be
modified until all the data has been read.
When the selected pipe is in the receiving direction,
set this bit with one of the following procedures;
• Set this bit and the CURPIPE bits simultaneously.
• Set this bit and the ISEL bits simultaneously
when the DCP is set (CURPIPE = 000).
For details, refer to section 24.4.4, FIFO Buffer.
The bit width cannot be changed from the 8-bit width
to the 16-/32-bit width or from the 16-bit width to the
32-bit width while data is being written to the buffer
memory.
Rev. 1.00 Mar. 25, 2008 Page 1157 of 1868
REJ09B0372-0100