HD6417641 RENESAS [Renesas Technology Corp], HD6417641 Datasheet - Page 827

• Manufacturer Part Number: HD6417641
• Manufacturer: RENESAS [Renesas Technology Corp]

(USBIFR0/EP2 EMPTY = 0)
Data transmission to host
Clear EP2 empty status
IN token reception
in EP2 FIFO?
in EP2 FIFO?
Valid data
Space
Figure 20.11 EP2 Bulk-IN Transfer Operation
Yes
No
ACK
USB function
No
Yes
NACK
(USBIFR0/EP2
empty status
EMPTY = 1)
Set EP2
Interrupt request
Interrupt
request
Rev. 4.00 Sep. 14, 2005 Page 777 of 982
(USBIER0/EP2 EMPTY = 1)
(USBTRG/EP2 PKTE = 1)
Section 20 USB Function Module
to USBEP2 data register
Write one packet of data
(USBIFR0/EP2 TR = 0)
USBIER0/EP2 EMPTY
Write 1 to EP2 packet
Clear EP2 transfer
Enable EP2 FIFO
Application
empty interrupt
(USBEPDR2)
request flag
enable bit
interrupt
REJ09B0023-0400