7643 datasheet(250/424 Pages) RENESAS

250 / 424 page

Rev.2.00

Aug 28, 2006

page 129 of 202

7643 Group

REJ09B0133-0200

APPLICATION

2.6 USB

Fig. 2.6.24 Registers setting (1)

Frequency synthesizer control register (Address : 6C16)

FSC

Frequency synthesizer multiply register 1 (Address : 6D16)

FSM1

0016

Frequency synthesizer multiply register 2 (Address : 6E16)

FSM2

FF16

Frequency synthesizer divide register (Address : 6F16)

FSD

FF16

48 MHz clock

is generated

000 01

Clock control register (Address : 1F16)

CCR

XCOUT oscillation drive disabled.

XOUT oscillation drive enabled.

000 00

System clock : f(XIN)

USB control register (Address : 1316)

USBC

001

0 00

Frequency synthesizer lock status bit

LPF current control : High current (select intermediate current “10” after lock)

Frequency synthesizer : enabled

Frequency synthesizer input : f(XIN)

In default state after power-on/reset

USB line driver current control : High

USB line driver : enabled (Note)

USB clock disabled: USB clock turns to be enabled after setting frequency synthesizer.

USB function control unit disabled: USB clock turns to be enabled after initializing USB FCU.

Note: When using the MCU in Vcc = 3 V, clear bit 4 of USBC to “0” and

disable the built-in DC-DC converter.

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