SH7764 Datasheet, PDF (976/1752 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC Engine Family SH-4A Series

Section 21 USB 2.0 Host/Function Module (USB)
Bit
Bit Name
9
ACLRM
Initial
Value R/W
0
R/W
Description
Auto Buffer Clear Mode*³*⁴
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 21.15 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 and
before the pipe is selected by the CURPIPE bits.
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. 22, 2007 Page 920 of 1692
REJ09B0360-0100