H8SXSLASH1663 datasheet(863/1158 Pages) RENESAS

863 / 1158 page

Section 16 USB Function Module (USB)

Rev.1.00 Jun. 07, 2006 Page 811 of 1102

REJ09B0294-0100

16.9

Example of USB External Circuitry

1. USB Transceiver

This module supports the on-chip transceiver only, not the external transceiver.

2. D+ Pull-Up Control

The general output port (PM4) is used for D+ pull-up control pin. The PM4 pin is driven high

by the PULLUP_E bit of DMA when the USB cable VBUS is connected.

Thus, USB host/hub connection notification (D+ pill-up) is enabled.

3. Detection of USB Cable Connection/Disconnection

As USB states, etc., are managed by hardware in this module, a VBUS signal that recognizes

connection/disconnection is necessary. The power supply signal (VBUS) in the USB cable is

used for this purpose. However, if the cable is connected to the USB host/hub when the

function (system installing this LSI) power is off, a voltage (5 V) will be applied from the USB

host/hub. Therefore, an IC (such as an HD74LV1G08A or 2G08A) that allows voltage

application when the system power is off should be connected externally.

Vcc

Regulator*1

Vcc

(3.3 V)

VBUS

(5 V)

1.5 k

Ω

Vcc

(3.3 V)

DrVCC

(3.3 V)

USD+

D+

VBUS*3

PM4

Notes:

Vcc

USD-

DrVSS

Vss

GND

D-

USB connector

On-chip transceiver

External pull-up

control circuit

supporting full-speed

Reduce voltage to the operating voltage of this LSI (3.3 V).

To protect this LSI from being damaged, use the IC (such as HD74LV-A Series) which can

be applied voltage even when the system power is turned off.

Prevent noise from the VBUS pin while the USB is performing communication.

PULLUP_E

USB

Figure 16.22 Example of Circuitry in Bus Power Mode

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