SH7670 Datasheet, PDF (760/1292 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7670 Series

Section 17 USB 2.0 Host/Function Module (USB)
Bit
Bit Name
10
ATREPM
9
ACLRM
Initial
Value R/W
0
R/W
0
R/W
Description
For USB communication in auto response mode, set
this bit to 1 while the FIFO buffer is empty. Do not
write to the FIFO buffer during USB communication
in auto response mode.
When the pertinent pipe is for isochronous transfer,
be sure to set this bit to 0.
When the host controller function is selected, set this
bit to 0.
Auto Buffer Clear Mode
Enables or disables automatic buffer clear mode for
the pertinent pipe.
0: Disabled
1: Enabled (all buffers are initialized)
To delete the information in the FIFO buffer assigned
to the pertinent pipe completely, write 1 and then 0 to
this bit continuously.
Table 17.12 shows the information cleared by writing
1 and 0 to this bit continuously and the cases in
which clearing the information is necessary.
Modify this bit while CSSTS is 0 and PID is NAK.
Before modifying this bit after modifying the PID bits
for the corresponding pipe from BUF to NAK, check
that CSSTS and PBUSY are 0. However, if the PID
bits have been modified to NAK by this module,
checking PBUSY through software is not necessary.
Rev. 1.00 Nov. 14, 2007 Page 734 of 1262
REJ09B0437-0100