DF2211NP24V Renesas Technology / Hitachi Semiconductor, DF2211NP24V Datasheet - Page 559

• 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

(4) Remote-Wakeup Interrupt Processing
Figure 14.10 is a flowchart of remote-wakeup interrupt processing.
Figure 14.10 Example Flowchart of Remote-Wakeup Interrupt Processing
A USB operating clock
stabilization detection
Output resume signal
clock stabilization time
Start USB operating
USB function
A suspend/resume
clock oscillation
interrupt occurs
interrupt occurs
USB operating
has passed?
to USB bus
Yes
EXIRQx
Remote-
wakeup
IRQ6
No
USB operating clock stabilization
detection interrupt processing
Remote-wakeup
interrupt processing
Clear USB operating clock
stabilization detection flag
Execute remote-wakeup
Firmware
(Set DVR in UDRR to 1)
Wait for resume signal
(Clear CK48READY
Resume interrupt
(see figure 14.8)
from up-stream
in UIFR3 to 0)
processing
No
Rev.7.00 Dec. 24, 2008 Page 505 of 698
wakeup enabled
Is remote-
by host?
NMI or IRQx
(Clear SPRSi in UIFR3
Wait for USB operating
Resume main process
Clear USB module
clock stabilization
Yes
stop mode
to 0)
REJ09B0074-0700