H8SXSLASH1663M datasheet(1041/1504 Pages) RENESAS

1041 / 1504 page

Section 20 USB Function Module (USB)

Rev. 2.00 Sep. 24, 2008 Page 1009 of 1468

REJ09B0412-0200

(4)

Transition from Suspend State to Deep Software Standby Mode and Canceling Deep

Software Standby Mode

If the USB bus enters from the suspend state to deep software standby mode, perform the

operation as shown in figure 20.8. When canceling deep software standby mode, ensure enough

time for the system clock oscillation to be settled.

Transition from suspend state to

deep software standby mode

(1)

(2)

(3)

(4)

(5)

(6)

(7)

Detect that USB bus is in suspend state

Set SURSF in IFR2 to 1

USBINTN interrupt

Clear SURSF in IFR2 to 0

Check if SURSS in IFR2 is set to 1

Clear SURSE in IER2 to 0

Clear SSRSME in IER2 to 0*

Clear DUSBIF in DPSIFR to 0

Set DUSBIE in DPSIER to 1

Shift to deep software standby mode

(execute SLEEP instruction)

Stop all clocks of LSI

Canceling deep software standby mode

Detect that USB bus is in resume state

RESUME interrupt

Cancel deep software standby mode

Wait for system clock oscillation to be settled

Clear SURSF in IFR2 to 0

Check if SURSS in IFR2 is cleared to 0

USB communications can be resumed

through USB registers

Denotation of figures

: Operation by firmware setting

: Automatic operation by LSI hardware

(8)

(9)

(10)

(13)

(14)

(11)

(12)

Set SURSE in IER2 to 1

Set SSRSME in IER2 to 0

Clear DUSBIF in DPSIFR to 0

Clear DUSBIE in DPSIER to 0

Execute reset sequence

Cancel module stop

Note:

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 20.8 Flow of Transition to and Canceling Deep Software Standby Mode

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