H8SSLASH2218 datasheet(553/750 Pages) RENESAS

Il numero della parte	H8S/2218

Spiegazioni elettronici	16-Bit Single-Chip Microcomputer H8S Family/H8S/2200 Series

PDF	750 Pages

Scroll/Zoom	100%

Produttore elettronici	RENESAS [Renesas Technology Corp]

Homepage	http://www.renesas.com

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553 / 750 page

Section 14 Universal Serial Bus (USB)

Rev.6.00 Jun. 03, 2008 Page 505 of 698

REJ09B0074-0600

(4) Remote-Wakeup Interrupt Processing

Figure 14.10 is a flowchart of remote-wakeup interrupt processing.

USB function

Firmware

Remote-wakeup

interrupt processing

USB operating clock stabilization

detection interrupt processing

Start USB operating

clock oscillation

Output resume signal

to USB bus

A suspend/resume

interrupt occurs

A USB operating clock

stabilization detection

interrupt occurs

Wait for resume signal

from up-stream

Clear USB operating clock

stabilization detection flag

(Clear CK48READY

in UIFR3 to 0)

Execute remote-wakeup

(Set DVR in UDRR to 1)

Resume interrupt

processing

(see figure 14.8)

Clear USB module

stop mode

(Clear SPRSi in UIFR3

to 0)

Wait for USB operating

clock stabilization

Resume main process

USB operating

clock stabilization time

has passed?

Yes

EXIRQx

IRQ6

Is remote-

wakeup enabled

by host?

NMI or

IRQx

Remote-

wakeup

Figure 14.10 Example Flowchart of Remote-Wakeup Interrupt Processing

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