H8SXSLASH1663M datasheet(1034/1504 Pages) RENESAS

1034 / 1504 page

Section 20 USB Function Module (USB)

Rev. 2.00 Sep. 24, 2008 Page 1002 of 1468

REJ09B0412-0200

20.5

Operation

20.5.1

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 20.2 Cable Connection Operation

The above flowchart shows the operation in the case of in section 20.9, 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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