Renesas R5S72621 Manual Do Utilizador

 
Section 26   USB 2.0 Host/Function Module 

Page 1352 of 2108 

 

R01UH0134EJ0400  Rev. 4.00 

 

 Sep 

24, 

2014 

SH7262 Group, SH7264 Group

5 DRPD  0  R/W 

D

/D Line Resistor Control 

Enables or disables pulling down D+ and D- lines 
when the host controller function is selected. 

0: Pulling down the lines is disabled. 

1: Pulling down the lines is enabled. 

This bit should be set to 1 if the host controller 
function is selected, and should be set to 0 if the 
function controller function is selected. 

4 DPRPU 0  R/W 

D

 Line Resistor Control 

Enables or disables pulling up D+ line when the 
function controller function is selected. 

0: Pulling up the line is disabled. 

1: Pulling up the line is enabled. 

Setting this bit to 1 when the function controller 
function is selected allows this module to pull up the 
D+ line to 3.3 V, thus notifying the USB host of 
connection. Modifying this bit from 1 to 0 allows this 
module to cancel pulling up the D+ line, thus notifying 
the USB host of disconnection. 

This bit should be set to 1 if the function controller 
function is selected, and should be set to 0 if the host 
controller function is selected. 

Note:  Set this bit to 0 when the USB is disconnected. 

Include the following processing when this bit is 
changed from 1 to 0. 

 

(1) Set the DPRPU bit to 0. 

 

(2) Wait for at least 1 

s. 

 

(3) Set the DCFM bit to 1. 

 

(4) Wait for at least 200 ns. 

 

(5) Set the DCFM bit to 0. 

3 to 1 

 All 

0 

R 

Reserved 

These bits are always read as 0. The write value 
should always be 0.