SH7708 datasheet(186/633 Pages) RENESAS

186 / 633 page

168

Table 9.5

Range of Usable Frequencies for Each Clock Operating Mode(SH7708R) (cont)

Clock

Mode

FRQCR

PLL1

PLL2

Clock

Rate*

(I:B:P)

Input Frequency

Range

CKIO Frequency

Range

H'0100

H'0101

H'0102

ON (

× 1)

ON (

× 1)

ON (

× 1)

OFF

1:1:1

1:1:1/2

1:1:1/4

16 MHz to 33.3 MHz

16 MHz to 60 MHz

16 MHz to 33.3 MHz

16 MHz to 60 MHz

H'0111

H'0112

H'0115

H'0116

ON (

× 2)

ON (

× 2)

ON (

× 2)

ON (

× 2)

OFF

2:1:1

2:1:1/2

1:1:1

1:1:1/2

16 MHz to 33.3 MHz

16 MHz to 50 MHz

16 MHz to 33.3 MHz

16 MHz to 50 MHz

16 MHz to 33.3 MHz

16 MHz to 50 MHz

16 MHz to 33.3 MHz

16 MHz to 50 MHz

H'0122

H'0126

H'012A

ON (

× 4)

ON (

× 4)

ON (

× 4)

OFF

4:1:1

2:1:1

1:1:1

16 MHz to 25 MHz

H’A100

H’E100

H’E101

ON (

× 3))

ON (

× 3)

ON (

× 3)

OFF

3:1:1

1:1:1

1:1:1/2

25 MHz to 33.3 MHz

Notes: 1. Input clock frequency is 1

2. Max frequency : I

φ = 100 MHz, Bφ = (CKIO) = 60 MHz, Pφ = 30 MHz

Cautions:

1. When clock operating modes 3 and 4 are used:

• The on/off state of PLL circuit 1 is set by the frequency control register.

• PLL circuit 1 is initialized to the off state by a power-on reset.

• Always turn PLL circuit 1 off before going into standby mode.

2. The input to divider 1 becomes the output of:

• PLL circuit 1 when PLL circuit 1 is on.

• PLL circuit 2 when PLL circuit 1 is off and PLL circuit 2 is on.

• Divider 3 when PLL circuit 1 is off and PLL circuit 2 is off.

3. The input of divider 2 becomes the output of:

• PLL circuit 1 when the clock operating mode is 0–2 or 7.

• PLL circuit 2 when the clock operating mode is 3 and 4 and PLL circuit 2 is on.

• Divider 3 when the clock operating mode is 3 and 4 and PLL circuit 2 is off.

4. The frequency of the internal clock (I

φ) becomes:

• The product of the frequency of the CKIO pin, the frequency multiplication ratio of

PLL circuit 1, and the division ratio of divider 1 when PLL circuit 1 is on.

• Equal to the frequency of CKIO pin when PLL circuit 1 is off.

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