DF2211NP24V Renesas Technology / Hitachi Semiconductor, DF2211NP24V Datasheet - Page 558

• 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) Suspend and Remote-Wakeup Operations
Rev.7.00 Dec. 24, 2008 Page 504 of 698
REJ09B0074-0700
Figures 14.9 and 14.10 are flowcharts of the suspend and remote-wakeup operations. If the
USB bus enters a non-suspend state from the suspend state due to a remote-wakeup signal from
this function, perform the operations shown below.
Notes: 1. The standby enable flag is a software flag for controlling transition to the standby
Figure 14.9 Example Flowchart of Suspend and Remote-Wakeup Operations
USB cable connected
Output resume signal
A bus idle of 3 ms or
USB function
A suspend/resume
A suspend/resume
interrupt occurs
interrupt occurs
Suspend state
more occurs
to USB bus
2. Interrupts should be masked from when the IRQ6 interrupt is received until the
state (one of the power-down modes). There is no such hardware flag.
SLEEP instruction is executed. Finally, unmask the interrupts using the LDC
instruction or the like and execute the SLEEP instruction immediately afterward.
IRQ6
Remote-
wakeup
Suspend/remote-wakeup
interrupt processing
interrupt processing
Firmware
Suspend interrupt
(see figure 14.10)
(see figure 14.8)
Remote-wakeup
processing
NMI or IRQx
IRQ6
Main process
(Set SPRSiE in UIER3 to 1)
of the power-down modes
In one of the power-down
(Set IRQ6E in IER to 1)
(Set IRQ6E in IER to 1)
(Clear standby enable
(Manipulate bit I using
Enable IRQ6 interrupt
(Clear bit I using LDC
LDC instruction, etc.)
Unmask all interrupts
Enable SPRSi and
Run user program
Mask all interrupts
Initialize standby
Transition to one
(Execute SLEEP
Standby enable
Standby enable
instruction, etc.)
IRQ6 interrupts
enable flag
instruction)
flag = 0?
flag = 1?
flag to 0)
modes
Yes
Yes
*1
*1
*1
*2
*2
*2
No
No