DF2211NP24V Renesas Technology / Hitachi Semiconductor, DF2211NP24V Datasheet - Page 568

• 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

Rev.7.00 Dec. 24, 2008 Page 514 of 698
REJ09B0074-0700
Clear EP1 FIFO empty status
(EP1EMPTY in UIFR1 = 0)
Transmit data to host
Receive IN token
in EP1 FIFO?
in EP1 FIFO?
Valid data
Space
Yes
No
ACK
Figure 14.18 EP1 Bulk-In Transfer Operation
USB function
No
Yes
Set EP1 FIFO empty status
(EP1EMPTY in UIFR1 = 1)
NAK
EXIRQx
No
Write 1 to EP1 packet enable bit
USB endpoint data register 1
(EP1EMPTYE in UIER1 = 1)
UIFR1/EP1EMPTY interrupt
(EP1EMPTYE in UIER1 = 0)
Write 0 to EP1 FIFO empty
(write one packet of data
(EP1PKTE in UTRG0 = 1)
data to be transmitted
data to be transmitted
Write 1 to EP1 FIFO
interrupt enable bit
empty enable
to UEDR1)
Firmware
in host?
to host?
Is there
Is there
Yes
Yes
No