SH7672 datasheet(375/1292 Pages) RENESAS

375 / 1292 page

Section 9 Clock Pulse Generator (CPG)

Rev. 1.00 Nov. 14, 2007 Page 349 of 1262

REJ09B0437-0100

9.3

Clock Operating Modes

Table 9.2 shows the relationship between the combinations of the mode control pins (MD_CK1

and MD_CK0) and the clock operating modes. Table 9.3 shows the usable frequency ranges in the

clock operating modes.

Table 9.2

Clock Operating Modes

Pin Values

Clock I/O

Mode MD_CK1

MD_CK0

Source

Output

Divider

PLL Circuit

On/Off

CKIO Frequency

EXTAL or

crystal

resonator

CKIO

ON (

× 8, 12)

(EXTAL or crystal

resonator)

× 4

EXTAL

CKIO

1/2

ON (

× 8, 12)

(EXTAL or crystal

resonator)

× 2

CKIO



1/4

ON (

× 8, 12)

(CKIO)

USB_X1 or

crystal

resonator

CKIO

1/2

ON (

× 8)

(USB_X1 or crystal

resonator)

× 2

• Mode 0

In mode 0, clock is input from the EXTAL pin or the crystal resonator. The PLL circuit shapes

waveforms and the frequency is multiplied according to the frequency control register setting

before the clock is supplied to the LSI. The oscillating frequency for the crystal resonator and

EXTAL pin input clock ranges from 15 to 25 MHz*. The frequency range of CKIO is from 60

to 100 MHz*. To reduce current supply, pull up the USB_X1 pin and open the USB_X2 pin

when USB is not used.

Note: * These are target values that were set when we prepared this hardware manual. We will

determine the guaranteed maximum frequencies after the final evaluation result of this

LSI is obtained.

• Mode 1

In mode 1, clock is input from the EXTAL pin. The PLL circuit shapes waveform and the

frequency is multiplied according to the frequency control register setting before the clock is

supplied to the LSI. The oscillating frequency for the EXTAL pin input clock ranges from 30*

to 50 MHz*. The frequency range of CKIO is from 60 to 100 MHz*. To reduce current supply,

pull up the USB_X1 pin and open the USB_X2 pin when USB is not used.

Note: * These are target values that were set when we prepared this hardware manual. We will

determine the guaranteed maximum frequencies after the final evaluation result of this

LSI is obtained.

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