H8SXSLASH1663M datasheet(1036/1504 Pages) RENESAS

1036 / 1504 page

Section 20 USB Function Module (USB)

Rev. 2.00 Sep. 24, 2008 Page 1004 of 1468

REJ09B0412-0200

USB cable connected

Bus idle of 3 ms or

more occurs

Suspend/resume

interrupt occurs

(IFR2/SURSF = 1)

RESUME

Remote

wakeup enabled?

(CTLR/RWUPS = 1?)

Clear SURSF in IFR2 to 0

Check if SURSS in IFR2

is set to 1

Clear SURSE in IER2 to 0

Wait for suspend/

resume interrupt

Yes

Enter deep software

standby mode

Check remote-wakeup

function enabled

System needs to

enter power-down

mode?

Check remote-wakeup

function disabled

Yes

Need to enter

software standby

mode?

USB function

Application

Set SSRSME in IER2 to 0

Set SSRSME in IER2 to 1

USB module stop

Need to enter deep

software standby

mode?

Clear RAMCUT in

DPSTBYCR to 0

Set WTSTS5 to WTSTS0

in DPSBWCR

Clear DUSBIF in

DPSIFR to 0

Set DUSBIE in DPSIER to 1

Set STS5 to STS0 in SBYCR

Clear SURSE in IER2 to 0

Enter software

standby mode

Yes

Set SURSE in IER2 to 1

Clear SSRSME in IER2 to 0

Notes:

For details, see section 28, Power-Down Modes.

When the USB enters deep software standby mode, the sources to cancel software standby mode may be conflicted.

In this figure, the operation to cancel software standby mode is not performed. For details, see section 28.12, Usage Notes.

Figure 20.4 Suspend Operation

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