HD6417641 RENESAS [Renesas Technology Corp], HD6417641 Datasheet - Page 840

• Manufacturer Part Number: HD6417641
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 20 USB Function Module
20.9.2
Figures 20.21 to 20.23 show flowcharts for initializing, entering standby mode and awaking when
using the USB bus power control method.
Rev. 4.00 Sep. 14, 2005 Page 790 of 982
REJ09B0023-0400
IRQ1_USB
Peripheral
SUSPEND
IRQ1
IRQ0
AWAKE
IRQ0_
clock
Usage Example of USB Bus Power Control Method
This LSI
signal (internal signal)
operation
Normal
(internal signal)
AWAKE signal
USB suspend
Figure 20.19 IRQ0 and IRQ1 Interrupt Circuitry
IRQ1 interrupt
Figure 20.20 USB Standby Operation Timing
IRQ1 interrupt
detected
instruction issued
USBIFR2/
USBIFR2/
routine
AWAKE
SUSPS
SLEEP
S
S
Q
Q
USBCTRL/
SUSPEND
Standby
IRQ0 interrupt
state
detected
0
1
0
1
IRQ1_SUSPEND
USBIFR2/SUSPS
IRQ0_AWAKE
cleared
IRQ0 interrupt
routine
RTE instruction
USBIFR2/AWAKE
IRQ1 interrupt
IRQ0 interrupt
Interrupt controller
IRQ1 interrupt
cleared
(INTC)
routine
RTE instruction
operation
Normal