H8SX1663 datasheet(840/1158 Pages) RENESAS

840 / 1158 page

Section 16 USB Function Module (USB)

Rev.1.00 Jun. 07, 2006 Page 788 of 1102

REJ09B0294-0100

16.5

Operation

16.5.1

Cable Connection

USB function

Application

Cable disconnected

VBUS pin = 0 V

UDC core reset

USB cable connection

IFR1.VBUSF = 1

USB bus connection interrupt

UDC core reset release

Bus reset reception

IFR0.BRST = 1

Bus reset interrupt

Wait for setup command

reception complete interrupt

General output port

D+ pull-up enabled?

USB module interrupt

setting

As soon as preparations are

completed, enable D+ pull-up

in general output port

Clear VBUSF flag

(IFR1.VBUSF)

Firmware preparations for

start of USB communication

Clear bus reset flag

(IFR0.BRST)

Clear FIFOs

(EP0, EP1, EP2, EP3)

Yes

Initial

settings

Wait for setup command

reception complete interrupt

Interrupt request

Figure 16.2 Cable Connection Operation

The above flowchart shows the operation in the case of in section 16.9, Example of USB External

Circuitry.

In applications that do not require USB cable connection to be detected, processing by the USB

bus connection interrupt is not necessary. Preparations should be made with the bus-reset

interrupt.

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