DF2211NP24V Renesas Technology / Hitachi Semiconductor, DF2211NP24V Datasheet - Page 553

• 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

(2) USB Cable Connection (When USB module stop or power-down mode is used)
If the USB cable enters the connection state from the disconnection state in an application (self
powered) where USB module stop or power-down mode is used, perform the operation as
shown in figure 14.4.
Receive bus reset from the host
Note:
A bus reset interrupt occurs
clock stabilization time has
Connect the USB cable
A USB operating clock
stabilization detection
Start USB operating
Start USB module
*
interrupt occurs.
clock oscillation
USB operating
A VBUS interrupts in the USB module cannot be detected in power-down mode or in the USB module stop state.
Accordingly, in an application (self powered) where power-down mode or USB module stop is used,VBUS
interrupts of the USB must be detected via the external interrupt pin IRQx.
In this case, the IRQx pin must be specified as both-edge sensitive. When IRQx is used, VBUS interrupts in the
USB module need not to be used.
operation
passed?
USB function
Yes
(When USB Module Stop or Power-Down Mode Is Used)
Figure 14.4 USB Cable Connection
No
*
External interrupt IRQx*
EXIRQx
EXIRQx
Yes
Clear MSTPB0 in MSTPCRB to 0
Clear CK48READY in UIFR3 to 0
(Clear UDCRST in UCTLR to 0)
Wait for USB operating clock
Cancel USB module stop 2
Rev.7.00 Dec. 24, 2008 Page 499 of 698
Cancel UDC core reset
port function in IRQx
Enable D+ pull-up by
Wait for setup interrupt
Power-down mode?
Yes
Check by using the
Initialize the firmware
Clear all FIFOs
System ready?
USB module
port 36 (P36)
Firmware
stabilization
stopped?
Yes
No
No
REJ09B0074-0700
No
Check the USB
cable connection
state