Renesas SH7264 User Manual

 

Section 26   USB 2.0 Host/Function Module 

R01UH0134EJ0400  Rev. 4.00  

 

Page 1419 of 2108 

Sep 24, 2014 

 

 

 
SH7262 Group, SH7264 Group 

15 BSTS 

0  R  Buffer 

Status 

Indicates whether DCP FIFO buffer access is 
enabled or disabled. 

0: Buffer access is disabled. 

1: Buffer access is enabled. 

The meaning of the BSTS bit depends on the ISEL 
bit setting as follows.  

  When ISEL = 0, BSTS indicates whether the 

received data can be read from the buffer.  

  When ISEL = 1, BSTS indicates whether the 

data to be transmitted can be written to the 

buffer. 

14 SUREQ  0  R/W*

2

 

SETUP Token Transmission 

Transmits the setup packet by setting this bit to 1 
when the host controller function is selected.  

0: Invalid 

1: Transmits the setup packet. 

After completing the setup transaction process, this 
module generates either the SACK or SIGN 
interrupt and clears this bit to 0. 

This module also clears this bit to 0 when the 
SUREQCLR bit is set to 1. 

Before setting this bit to 1, set the DEVSEL bits, 
USBREQ register, USBVAL register, USBINDX 
register, and USBLENG register appropriately to 
transmit the desired USB request in the setup 
transaction. 

Before setting this bit to 1, check that the PID bits 
for the DCP are set to NAK. After setting this bit to 
1, do not modify the DEVSEL bits, USBREQ 
register, USBVAL register, USBINDX register, or 
USBLENG register until the setup transaction is 
completed (SUREQ = 1). 

Write 1 to this bit only when transmitting the setup 
token; for the other purposes, write 0. 

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