Figure 20.24 Timing For Setting The Tr Interrupt Flag - Renesas HD6417641 Hardware Manual

Section 20 USB Function Module
CPU
IN token
Host
USB

Figure 20.24 Timing for Setting the TR Interrupt Flag

Rev. 4.00 Sep. 14, 2005 Page 796 of 982
REJ09B0023-0400
TR interrupt routine
Check NAK
NAK
Set TR flag
Clear TR flag, Write transmit
data, and TRG/PKTE
IN token
Check NAK
NAK
Set TR flag
(flag is set again)
TR interrupt routine
IN token
Data
transmission
ACK