SH7721 datasheet(526/1524 Pages) RENESAS

526 / 1524 page

Section 11

Clock Pulse Generator (CPG)

Rev. 3.00 Jan. 18, 2008 Page 464 of 1458

REJ09B0033-0300

11.4.2

USBH/USBF Clock Control Register (UCLKCR)

The USBH/USBF clock control register is an 8-bit readable/writable register. UCLKCR is

initialized to H'60 by a power-on reset. Word-size access is used to write to this register. This

writing should be performed with H'A5 in the upper byte and the write data in the lower byte.

Bit

Bit Name

Initial

Value

R/W

Description

USSCS2

USSCS1

USSCS0

R/W

Source Clock Select

These bits select the source clock.

000: Clock stopped

001: Setting prohibited

010: Setting prohibited

011: Initial value

(To run the USBH/USB, however, change the setting to

"110: EXTAL_USB" or "111: USB crystal resonator".)

100: Setting prohibited

101: Setting prohibited

110: EXTAL_USB

111: USB crystal resonator

USSTB

R/W

Standby USB Crystal

Specifies stop or operation of the USB crystal oscillator

in standby mode.

0: USB crystal oscillator stops in standby mode when the

STBXTL bit (bit 4) in the STBCR register is 0.

1: USB crystal oscillator continues operating in standby

mode

3 to 0



All 0

Reserved

These bits are always read as 0. The write value should

always be 0.

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