H8SSLASH2218 datasheet(547/750 Pages) RENESAS

547 / 750 page

Section 14 Universal Serial Bus (USB)

Rev.6.00 Jun. 03, 2008 Page 499 of 698

REJ09B0074-0600

(2) USB Cable Connection (When USB module stop or power-down mode is used)

If the USB cable enters the connection state from the disconnection state in an application (self

powered) where USB module stop or power-down mode is used, perform the operation as

shown in figure 14.4.

Connect the USB cable

USB function

Firmware

Yes

Receive bus reset from the host

A bus reset interrupt occurs

Start USB operating

clock oscillation

USB operating

clock stabilization time has

passed?

Cancel USB module stop 2

Clear MSTPB0 in MSTPCRB to 0

Check by using the

port function in

IRQx

Clear CK48READY in UIFR3 to 0

Enable D+ pull-up by

port 36 (P36)

Initialize the firmware

Wait for setup interrupt

Yes

Cancel UDC core reset

(Clear UDCRST in UCTLR to 0)

Clear all FIFOs

Wait for USB operating clock

stabilization

A USB operating clock

stabilization detection

interrupt occurs.

System ready?

Power-down mode?

USB module

stopped?

Start USB module

operation

EXIRQx

External interrupt

IRQx*

Note:

A VBUS interrupts in the USB module cannot be detected in power-down mode or in the USB module stop state.

Accordingly, in an application (self powered) where power-down mode or USB module stop is used,VBUS

interrupts of the USB must be detected via the external interrupt pin

IRQx.

In this case, the

IRQx pin must be specified as both-edge sensitive. When IRQx is used, VBUS interrupts in the

USB module need not to be used.

Check the USB

cable connection

state

Figure 14.4 USB Cable Connection

(When USB Module Stop or Power-Down Mode Is Used)

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