SH7641 Datasheet, PDF (840/1036 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH™ RISC engine Family / SH7641 Series

Section 20 USB Function Module
This LSI
IRQ1
IRQ0
USB suspend
signal (internal signal)
S
Q
USBIFR2/
SUSPS
AWAKE signal
(internal signal)
S
Q
0
IRQ1_SUSPEND
1
IRQ1 interrupt
USBCTRL/
SUSPEND
IRQ0_AWAKE
0
1
IRQ0 interrupt
Interrupt controller
(INTC)
USBIFR2/
AWAKE
Figure 20.19 IRQ0 and IRQ1 Interrupt Circuitry
Normal
operation
Peripheral
clock
IRQ1 interrupt
routine
IRQ1_USB
SUSPEND
IRQ0_
AWAKE
IRQ1 interrupt
detected
SLEEP
instruction issued
Standby
state
IRQ0 interrupt
routine
IRQ1 interrupt Normal
routine
operation
USBIFR2/SUSPS
cleared
USBIFR2/AWAKE
cleared
IRQ0 interrupt
detected
RTE instruction RTE instruction
Figure 20.20 USB Standby Operation Timing
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