M66592FP datasheet(49/127 Pages) RENESAS

49 / 127 page

M66592F P/W G

Rev 1.00 2004.10.01 page 49 of 125

3.1.4

USB data bus resistor control

Figure 3.1 shows a diagram of the connections between the controller and the USB connectors.

The controller has a built-in pull-up resistor for the D+ signal. “1” should be set for the DPRPU bit of the SYSCFG

Also, the controller has a built-in terminal resistor for use when the D+ and D- signals are operating at Hi-Speed,

and a built-in output resistor for Full-Speed operation. The controller automatically switches the built-in resistor

after connection with the PC, by means of reset handshake, suspended state and resume detection. If a disconnection

from the PC is detected, the H/W should be initialized by means of an S/W reset (USBE=0).

If “0” is set for the DPRPU bit of the SYSCFG register, the pull-up resistor (or the terminal resistor) of the USB

data line is disabled, making it possible to notify the host controller of the device disconnection.

M66592FP/WG

VBUS

USB connector

4 GND

D-

D+

Vbus

RERFIN

5.6K

Ω

Impedance control has to be taken into

consideration when designing the D+

and D- lines.

1~10µF

The capacitance of 1 to 10

µF

stipulated by the USB specification

is necessary for the VBUS signal.

Figure 3.1 UBS connector connections

3.1.5

Clock supply control

Figure 3.2 shows a block diagram of the controller clock control. Frequency of the input clock for the XIN pin should

be selected using the XTAL bit of the SYSCFG register, while the oscillation buffer is enabled using the XCKE bit and

the clock supply is controlled using the RCKE, PLLC, and SCKE bits. For information on the register control timing,

please refer to 3.1.7, State transition timing.

Auto clock supply

Low-power

control

Input

clock

Oscillation

buffer

XCKE

(bit13)

PLLC, SCKE

(bit11, bit10)

Internal

clock

PLL

Clock control unit

RCKE

(bit12)

Divider

circuit

PCUT

(bit1)

ATCKM

(bit8)

Figure 3.2 Clock control block

M66592FP Datasheet(PDF) 49 Page - Renesas Technology Corp

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