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Section 26 USB 2.0 Host/Function Module
R01UH0134EJ0400 Rev. 4.00 Page 1447 of 2108
Sep 24, 2014
SH7262 Group, SH7264 Group
Bit Bit Name
Initial
Value R/W Description
10 ATREPM 0 R/W 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.
9 ACLRM 0 R/W 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 all the information assigned to the
pertinent pipe from the FIFO buffer, write 1 and 0 in
succession to the ACLRM bit.
Table 26.11 (1) lists the information related to the
USB 2.0 host/function module that is cleared by
setting the ACLRM bit to 1 and then to 0 in
succession. Table 26.11 (2) lists the cases in which it
is necessary to do this.
Modify this bit while CSSTS is 0, PID is NAK, and the
pertinent pipe is not specified in 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 is not necessary.