SH7670 Datasheet, PDF (681/1292 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7670 Series

Bit
Bit Name
14
REW
13, 12 
11, 10 MBW[1:0]
Section 17 USB 2.0 Host/Function Module (USB)
Initial
Value
0
All 0
00
R/W
R/W*
R
R/W
Description
Buffer Pointer Rewind
Specifies whether or not to rewind the buffer pointer.
0: The buffer pointer is not rewound.
1: The buffer pointer is rewound.
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).
Do not set REW to 1 simultaneously with modifying
the CURPIPE bits. Before setting REW to 1, be sure
to check that FRDY is 1.
To re-write to the FIFO buffer again from the first
data for the pipe in the transmitting direction, use the
BCLR bit.
Reserved
These bits are always read as 0. The write value
should always be 0.
CFIFO 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
When the selected pipe is in the receiving direction,
once reading data is started after setting these bits,
these bits should not be modified until all the data
has been read.
When the selected pipe is in the receiving direction,
set the CURPIPE and MBW bits simultaneously.
When the selected pipe is in the transmitting
direction, 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.
The odd number of bytes can also be written through
byte-access control even when 8- or 16-bit width is
selected.
Rev. 1.00 Nov. 14, 2007 Page 655 of 1262
REJ09B0437-0100