SH7263 Datasheet, PDF (1337/1862 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7260 Series

Section 25 USB 2.0 Host/Function Module (USB)
(4) USB Data Bus Resistor Control
Figure 25.1 shows a diagram of the connections between this module and the USB connectors.
This module incorporates a pull-up resistor for the D+ signal and a pull-down resistor for the D+
and D- signals. These signals can be pulled up or down using the DPRPU and DMRPD bits in
SYSCFG.
This module controls the terminal resistor for the D+ and D- signals during high-speed operation
and the output resistor for the signals during full-speed operation. This module automatically
switches the resistor after connection with the host controller or peripheral device by means of
reset handshake, suspended state and resume detection. If a disconnection from the host controller
or peripheral device is detected, this module should be initialized by a software reset.
When the function controller function is selected and the DPRPU bit in SYSCFG is cleared to 0
during communication with the host controller, the pull-up resistor (or the terminal resistor) of the
USB data line is disabled, making it possible to control the device connection and disconnection
using software with the USB cable being connected.
This LSI
VBUS
5V
(Host side)
Impedance control has to be
taken into consideration when
designing the D+ and D- lines.
DM
DP
REFRIN
5.6 kΩ
1
2 ^Vbus
D-
3 _D+
4 _GND
USB connector
Figure 25.1 UBS Connector Connection
Rev. 2.00 Mar. 14, 2008 Page 1303 of 1824
REJ09B0290-0200