SH7670 Datasheet, PDF (770/1292 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
12
CSSTS
11, 10 
9
ACLRM
Initial
Value R/W
0
R/W
All 0 R
0
R/W
Description
CSSTS Status Bit
Indicates the C-SPLIT status of the split transaction
when the host controller function is selected.
0: START-SPLIT (S-SPLIT) transaction being
processed or the transfer not using the split
transaction in progress
1: C-SPLIT transaction being processed
This module sets this bit to 1 upon start of the C-
SPLIT and clears this bit to 0 upon detection of C-
SPLIT completion.
Indicates the valid value only when the host
controller function is selected.
Reserved
These bits are always read as 0. The write value
should always be 0.
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 17.15 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. 14, 2007 Page 744 of 1262
REJ09B0437-0100