DF2211NP24V Renesas Technology / Hitachi Semiconductor, DF2211NP24V Datasheet - Page 566

• Manufacturer Part Number: DF2211NP24V
• Description: H8S/2200 Series, 2212 Group, USB, RTC, HSS TNP-64B; Vcc= 2.7 to 3.6 volts, Temp= -20 to 75 C; Package: PVQN0064LB-A
• Manufacturer: Renesas Technology / Hitachi Semiconductor

14.5.5
Rev.7.00 Dec. 24, 2008 Page 512 of 698
REJ09B0074-0700
Note:
This flowchart shows just one example of interrupt-in transfer processing. Other possibilities include an
operation flow in which, if there is data to be transmited, the EP3DE bit UDSR is referred to confirm that the
FIFO is empty, and then data is written to the FIFO.
Interrupt-In Transfer (Endpoint 3)
(EP3TS in UIFR0 = 1)
Transmit data to host
Receive IN token
Set EP3 transmit
in EP3 FIFO?
USB function
complete flag
Figure 14.17 EP3 Interrupt-In Transfer Operation
Valid data
Yes
ACK
No
NAK
EXIRQx
Write data to USB endpoint
Write data to USB endpoint
(EP3PKTE in UTRG0 = 1)
(EP3PKTE in UTRG0 = 1)
data register 3 (UEDR3)
data register3 (UEDR3)
(EP3TS in UIFR0 = 0)
Write 1 to EP3 packet
Write 1 to EP3 packet
Clear EP3 transmit
complete flag
transmit data
transmit data
enable bit
enable bit
Is there
to host?
Is there
to host?
Firmware
Yes
Yes
No
No