H8SXSLASH1663 datasheet(844/1158 Pages) RENESAS

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Section 16 USB Function Module (USB)

Rev.1.00 Jun. 07, 2006 Page 792 of 1102

REJ09B0294-0100

(3) Transition from Suspend State to Software Standby Mode and Canceling Software

Standby Mode

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

shown in figure 16.6. When canceling software standby mode, ensure enough time for the system

clock oscillation to be settled.

Transition from suspend state to

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 SURSF in IER2 to 0

Set SSRSME in IER2 to 1

Shift to software standby mode

(execute SLEEP instruction)

Stop all clocks of LSI

Canceling software standby mode

Detect that USB bus is in resume state

RESUME interrupt

Cancel 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

Set SURSF in IER2 to 1

Clear SSRSME in IER2 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)

(11)

(12)

Figure 16.6 Flow of Transition to and Canceling Software Standby Mode

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