Usage Example Of Usb Bus Power Control Method; Figure 20.19 Irq0 And Irq1 Interrupt Circuitry; Figure 20.20 Usb Standby Operation Timing - Renesas HD6417641 Hardware Manual

Section 20 USB Function Module
This LSI
IRQ1
USB suspend
signal (internal signal)
IRQ0
AWAKE signal
(internal signal)
Normal
operation
Peripheral
clock
IRQ1_USB
SUSPEND
IRQ0_
AWAKE
20.9.2

Usage Example of USB Bus Power Control Method

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
S
Q USBCTRL/
SUSPEND
USBIFR2/
SUSPS
S
Q
USBIFR2/
AWAKE

Figure 20.19 IRQ0 and IRQ1 Interrupt Circuitry

IRQ1 interrupt
routine
IRQ1 interrupt
detected
SLEEP
instruction issued

Figure 20.20 USB Standby Operation Timing

0
IRQ1_SUSPEND
1
IRQ0_AWAKE
0
1
Standby IRQ0 interrupt
state routine
USBIFR2/SUSPS
cleared
IRQ0 interrupt
detected
IRQ1 interrupt
IRQ0 interrupt
Interrupt controller
(INTC)
IRQ1 interrupt
routine operation
USBIFR2/AWAKE
cleared
RTE instruction RTE instruction
Normal