7643 datasheet(267/424 Pages) RENESAS

267 / 424 page

Rev.2.00

Aug 28, 2006

page 146 of 202

7643 Group

REJ09B0133-0200

APPLICATION

2.6 USB

Fig. 2.6.41 Register setting (USB resume interrupt)

USB resume signal interrupt status flag

USB interrupt status register 2 (Address : 5316)

USBIS2

Frequency synthesizer control register (Address : 6C16)

FSC

00 001

USB control register (Address : 1316)

USBC

Clock control register (Address : 1F16)

CCR

System clock : f(XIN) (Note 1)

00 000

Notes 1: When using the MCU in Vcc=3.3 V, set

φ to 6 MHz

(when using the MCU in Vcc=3 V and f(XIN)=24 MHz, clear bit 7 of CCR to “0”.)

2: When using the MCU in Vcc = 3.3 V, clear bit 4 of USBC to “0” and

disable the built-in DC-DC converter.

USB line driver current control : High

USB line driver : enabled (Note 2)

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

USB function control unit : enabled

Frequency synthesizer : enabled

Frequency synthesizer input : f(XIN)

LPF current control bit : (intermediate current)

Frequency synthesizer lock status bit

(7)

Application example 7: USB resume interrupt

Outline: Perform the resume process when the USB resume signal interrupt status flag is “1” in

the USB function interrupt routine.

Set the USB function interrupt enable bit to “1” (enabled).

This is an example when the MCU is operating at Vcc = 5V.

The following settings are required when using Vcc = 3V.

q Set USB line driver supply select bit (USB control register, bit 4) to “0” to disable the DC-DC

converter.

q Set

φ to 6MHz or less.

When f(XIN) = 24MHz, set bit 7 of the clock control register (XIN divider select bit) to “0”.

Figure 2.6.41 shows the related register settings and Figure 2.6.42 shows a control procedure

example.

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