H8SXSLASH1663 datasheet(842/1158 Pages) RENESAS

部件名	H8SX/1663

功能描述	Renesas 32-Bit CISC Microcomputer H8SX Family / H8SX/1600 Series

PDF	1158 Pages

Scroll/Zoom	100%

制造商	RENESAS [Renesas Technology Corp]

网页	http://www.renesas.com

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842 / 1158 page

Section 16 USB Function Module (USB)

Rev.1.00 Jun. 07, 2006 Page 790 of 1102

REJ09B0294-0100

16.5.3

Suspend and Resume Operations

(1) Suspend Operation

If the USB bus enters the suspend state from the non-suspend state, perform the operation as

shown in figure 16.4.

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 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 SURSE in IER2 to 1

Set SSRSME in IER2 to 1

Clear SSRSME in IER2 to 0

USB module stop

Figure 16.4 Suspend Operation

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