H8SSLASH2218 datasheet(579/750 Pages) RENESAS

579 / 750 page

Section 14 Universal Serial Bus (USB)

Rev.6.00 Jun. 03, 2008 Page 531 of 698

REJ09B0074-0600

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Specify

IRQ6 to falling edge sensitive

(Set IRQ6E in IER to 1)

(Write IRQ6SCB and IRQ6SCA

in ISCRH to 01

Cancel USB module stop2 mode

(Clear MSTPB0 in MSTPCRB to 0)

Enter USB module stop 2 state

(Stop MSTPB0 in MSTPCRB to 1)

USB communication operations can be

restarted by using various USB registers

Clear SPRSi in UIFR3 to 0

Mask all interrupts with LDC instruction, etc.*

Set IRQ6E in IER to 1*

Unmask all interrupts with LDC instruction, etc.*

Enter power-down mode*

(Execute SLEEP instruction)

IRQ6 = Low (falling edge output)

Set IRQ6F in ISR to 1

Set SPRSi and SPRSs in UIFR3 to 1

Confirm SPRSs in UIFR3 as 1

Clear IRQ6E in IER to 0*

Clear SPRSi in UIFR3 to 0

Detect USB bus suspend state

USPND pin = High

Procedure to enter power-down mode

Procedure to cancel power-down mode

Detect USB bus resume

USPND pin = Low

All USB module internal clocks stop

USB module intenal clock operation starts

Wait 2 ms for USB operation clock

to stabilize

(Wait for CK48READY in UIFR3 is set to 1)

All LSI internal clocks stop

IRQ6 = High

Cancel power-down mode

Wait for system clock stabilization time

(For external clok: 16 states min.)

(For crystal oscillator clock: 4 ms min.)

Enter active mode

(LSI internal clock starts oscillation)

IRQ6 = Low (falling edge output)

Set IRQ6F in ISR to 1

Set SPRSi of UIFR3 to 1

Clear SPRSs of UIFR3 to 0

Set CK48READY in UIFR3 to 1

(USB operating clock stabilized)

Detect SOF packet

Set SOF of UIFR3 to 1

: Indicates operations to be done

by firmware.

Guide to Flowchart Figures

: Indicates operations to be

automatically done by hardware

in this LSI.

Note: * Interrupts should be masked from when the

IRQ6 interrupt is received until the SLEEP instruction is executed.

Finally, unmask the interrupts using the LDC instruction or the like and execute the SLEEP instruction immediately

afterward.

Figure 14.28 Flowchart

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