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Section 26 USB 2.0 Host/Function Module
Page 1458 of 2108 R01UH0134EJ0400 Rev. 4.00
Sep 24, 2014
SH7262 Group, SH7264 Group
Bit Bit Name
Initial
Value R/W Description
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 26.14 (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 26.14 (2) lists the cases in which it
is necessary to do this.
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 is not necessary.