H8SXSLASH1663M datasheet(1038/1504 Pages) RENESAS

1038 / 1504 page

Section 20 USB Function Module (USB)

Rev. 2.00 Sep. 24, 2008 Page 1006 of 1468

REJ09B0412-0200

USB cable connected

USB bus in suspend state

Resume interrupts is

requested from the

up-stream.

Suspend/resume

interrupt occurs.

(IFR2/SURSF = 1)

RESUME

Start USB operating

clock oscillation

USB function

Application

Cancel software

standby mode

Clear SURSF in IFR2 to 0

Set SURSE in IER2 to 1

Clear SSRSME in IER2 to 0

Check if SURSS in IFR2 is

cleared to 0

Software standby

mode ?

USB module

stopped?

Oscillation stabilization

time has passed?

Yes

Cancel USB module stop

Return to normal state

Deep software

standby mode ?

Oscillation stabilization

time has passed?

Cancel deep software

standby mode

Yes

Cancel USB module stop

Clear SURSF in IFR2 to 0

Check if SURSS in IFR2 is

cleared to 0

Set SURSE in IER2 to 1

Clear SSRSME in IER2 to 0

Clear DUSBIF in

DPSIFR to 0

Clear DUSBIE in

DPSIER to 0

USB communications

can be resumed

Execute reset

exception handling

Note:

For details, see section 28.8, Deep Software Standby Mode.

Figure 20.5 Resume Operation from Up-Stream

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