SH7721 datasheet(899/1524 Pages) RENESAS

Part #	SH7721

Description	Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series

PDF	1524 Pages

Scroll/Zoom	100%

Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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899 / 1524 page

Section 25

USB Function Controller (USBF)

Rev. 3.00 Jan. 18, 2008 Page 837 of 1458

REJ09B0033-0300

25.4

Operation

25.4.1

Cable Connection

Yes

USB function

Application

Cable disconnected

VBUS pin = 0 V

UDC core reset

USB cable connection

USB1_pwr_en = 1?

IFR0/VBUSF = 1,VBUSMN= 1

USB bus connection or

disconnection detection interrupt

UDC core reset release

Bus reset reception

IFR0/BRST = 1

Bus reset interrupt

Wait for setup command

reception complete interrupt

IFR0/CFDN = 1

Endpoint information

load complete interrupt

USB module interrupt

setting

As soon as preparations are

completed, enable D+ pull-up

by USB1_pwr_en pin

Clear VBUS flag

(IFR0/VBUSF)

Firmware preparations for

start of USB communication

Clear bus reset flag

(IFR0/BRST)

Clear FIFOs

Wait for setup command

reception complete interrupt

Interrupt request

Initial

settings

Enable VBUS pin by

pin function controller

Set USB operation clock

USB module stop release

Write 50-byte endpoint

information to EPIR

Figure 25.3

Cable Connection Operation

SH7721 Datasheet(PDF) 899 Page - Renesas Technology Corp

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