Renesas R5S72621 Manual De Usuario

 

Section 26   USB 2.0 Host/Function Module 

R01UH0134EJ0400  Rev. 4.00  

 

Page 1445 of 2108 

Sep 24, 2014 

 

 

 
SH7262 Group, SH7264 Group 

13 CSCLR 

0  R/W* 

C-SPLIT Status Clear Bit 

When the host controller function is selected, setting 
this bit to 1 allows this module to clear the CSSTS bit 
to 0. 

0: Writing invalid 

1: Clears the CSSTS bit to 0. 

For the transfer using the split transaction, to restart 
the next transfer with the S-SPLIT forcibly, set this bit 
to 1. However, for the normal split transaction, this 
module automatically clears the CSSTS bit to 0 upon 
completion of the C-SPLIT; therefore, clearing the 
CSSTS bit is not necessary. 

Controlling the CSSTS bit through this bit must be 
done while UACT is 0 and thus communication is 
halted or while no transfer is being performed with 
bus disconnection detected. 

Setting this bit to 1 while CSSTS is 0 has no effect. 

When the function controller function is selected, be 
sure to write 0 to this bit. 

12 

CSSTS 

0 

R 

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. 

If the USB device is detached when processing of a 
C-SPLIT transaction is in progress, the CSSTS bit 
may remain set to 1. In such a case (DTCH = 1 
detected), use the CSCLR bit to clear the CSSTS bit 
to 0. 

Indicates the valid value only when the host 
controller function is selected. 

11 

 0 

R 

Reserved 

This bit is always read as 0. The write value should 
always be 0.