HD6417320 RENESAS [Renesas Technology Corp], HD6417320 Datasheet - Page 822

• Manufacturer Part Number: HD6417320
• Description: Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 23
• D+ Pull-up Control
Rev. 3.00 Jan. 18, 2008 Page 760 of 1458
REJ09B0033-0300
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.)
Figure 23.3
USB Pin Multiplex Controller
This LSI
USB function
USB1d_SUSPEND
USB1d_TXDPLS
Example 2 of Transceiver Connection for USB function Controller
USB1d_SPEED
USB1d_TXSEO
USB1d_TXENL
USB1d_DMNS
USB1_pwr_en
USB1d_DPLS
USBF_VBUS
USB1d_RCV
(On-Chip Transceiver is not Used)
3.3V
IC allowing voltage application
when system power is off
PDIUSBP11A etc.
IC1
SPEED
OE
VPO
VMO/FSEO
RCV
VP
VM
SUSPEND
D+
D−
IC2
IC allowing voltage application
when system power is off
1.5kΩ
USB connector
5V
VBUS
D+
D−
GND