DF2211NP24V Renesas Technology / Hitachi Semiconductor, DF2211NP24V Datasheet - Page 554

• 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

(3) USB Cable Disconnection (When USB module stop or power-down mode is not used)
Rev.7.00 Dec. 24, 2008 Page 500 of 698
REJ09B0074-0700
If the USB cable enters the disconnection state from the connection state in an application (self
powered) where USB module stop or power-down mode is not used, perform the operation as
shown in figure 14.5. In bus-powered mode, the power is automatically turned off when the
USB cable is disconnected and the following processing is not required.
Note:
Disconnect the USB cable
VBUS interrupt occurs
*
Reset the UDC core
VBUS interrupts in the USB module cannot be detected in power-down mode
or in the USB module stop state.
(When USB Module Stop or Power-Down Mode Is not Used)
USB function
Figure 14.5 USB Cable Disconnection
*
EXIRQx
Wait for USB cable connection
Write UDCRST in UCTLR to 1
Firmware
Clear VBUSi in UIFR3 to 0
Check if VBUSs in UIFR3
Cancel D + pull-up by
Reset the UDC core
is cleared to 0
port 36 (P36)