HD6417320 RENESAS [Renesas Technology Corp], HD6417320 Datasheet - Page 910

• Manufacturer Part Number: HD6417320
• Description: Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 25
25.4.6
Rev. 3.00 Jan. 18, 2008 Page 848 of 1458
REJ09B0033-0300
Note: This flowchart shows just one example of interrupt transfer processing. Other possibilities include an
EP3 Interrupt-In Transfer
USB Function Controller (USBF)
operation flow in which, if there is data to be transferred, the EP3 DE bit in the USB data status register
is referenced to confirm that the FIFO is empty, and then data is written to the FIFO.
Data transmission to host
Set EP3 transmission
(IFR0/EP3 TS = 1)
IN token reception
Figure 25.13
USB function
in EP3 FIFO?
complete flag
Valid data
Yes
ACK
EP3 Interrupt-In Transfer Operation
No
NAK
Interrupt request
Clear EP3 transmission
Write data to EP3 data
Write data to EP3 data
Write 1 to EP3 packet
Write 1 to EP3 packet
(TRG/EP3 PKTE = 1)
(TRG/EP3 PKTE = 1)
(IFR1/EP3 TS = 0)
register (EPDR3)
register (EPDR3)
for transmission
for transmission
complete flag
Is there data
Is there data
enable bit
enable bit
to host?
to host?
Application
Yes
Yes
No
No