beautypg.com

Renesas SH7641 User Manual

Page 846

background image

Section 20 USB Function Module

Rev. 4.00 Sep. 14, 2005 Page 796 of 982

REJ09B0023-0400

TR interrupt routine

TR interrupt routine

CPU

USB

Clear TR flag, Write transmit
data, and TRG/PKTE

IN token

Check NAK

Set TR flag

Host

NAK

IN token

Check NAK

Set TR flag
(flag is set again)

NAK

IN token

Data

transmission

ACK

Figure 20.24 Timing for Setting the TR Interrupt Flag

This manual is related to the following products: