SH7721 datasheet(822/1524 Pages) RENESAS

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Section 23

USB Pin Multiplex Controller

Rev. 3.00 Jan. 18, 2008 Page 760 of 1458

REJ09B0033-0300

This LSI

USB function

USB connector

USB1_pwr_en

USBF_VBUS

VBUS

−

GND

PDIUSBP11A etc.

SPEED

−

VPO

VMO/FSEO

RCV

SUSPEND

USB1d_SPEED

USB1d_TXENL

USB1d_TXDPLS

USB1d_TXSEO

USB1d_RCV

USB1d_DPLS

USB1d_DMNS

USB1d_SUSPEND

3.3V

1.5k

Ω

IC1

IC allowing voltage application

when system power is off

IC2

IC allowing voltage application

when system power is off

Figure 23.3

Example 2 of Transceiver Connection for USB function Controller

(On-Chip Transceiver is not Used)

• D+ Pull-up Control

Control D+ pull-up by using USB1_pwr_en pin in the system when the connection—

notification (D+ pull-up) to USB host or hub is wished to be inhibited (i.e., during high-

priority processing or initialization processing).

The D+ pull-up control signal and USBF_VBUS pin input signal should be controlled by using

the USB1_pwr_en pin and the USB cable VBUS (AND circuit) as is shown in examples of

figures 23.2 and 23.3

D+ pull-up is inhibited when the USB1_pwr_en pin is low in examples of figures 23.3 and

23.5. Use an IC such that allows voltage application when system power is off (for example,

HD74LV1G126A) for the pull-up control IC (IC2 in figures 23.2 to 23.5).

(The UDC core in this LSI holds the powered state when USBF_VBUS pin is low, regardless

of the D

+/D− state.)

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