SH7708 Datasheet, PDF(176/625 Page) Renesas Technology Corp – SuperH™ RISC engine

English

English German Russian Spanish Italian Polish Chinese Japanese Korean French Portuguese	Language :

SH7708 Datasheet, PDF (176/625 Pages) Renesas Technology Corp – SuperH™ RISC engine

◁

9 . 3 Clock Operating Modes

Table 9.3 shows the relationship between the mode control pin (MD2âMD0) combinations and the

clock operating modes. Table 9.4 shows the usable frequency ranges in the clock operating modes.

Table 9.3 Clock Operating Modes

Pin Values

Mod MD MD MD

e 210

Clock I/O PLL2 Div- PLL1 Divider

1

SourceOutput O n / O f f ider 3 On/OffInput

Divider

2

Input

CKIO

Frequenc

y

0 0 0 0 EXTAL CKIO On

Off ON

multi-

plication

ratio: 1

PLL1 PLL1

output

(EXTAL)

1 001

EXTAL CKIO On

Off ON

multi-

plication

ratio: 4

PLL1 PLL1

output

(EXTAL)

Ã4

2 010

Crystal CKIO On

Off On

oscillato

multi-

r

plication

ratio: 4

PLL1 PLL1

output

(Crystal)

Ã4

3 011

EXTAL CKIO

On

Off

multi-

plication

ratio: 1

Off PLL2

(initial output

value)

PLL2

(EXTAL)

Ã1

On PLL1

output

4 100

Crystal CKIO

oscillato

r

On

Off

multi-

plication

ratio: 1

Off PLL2

(initial output

value)

PLL2

(Crystal)

Ã1

On PLL1

output

7 1 1 1 CKIO â

Off Off On PLL1 PLL1 (CKIO)

output

Mode 0: An external clock is input from the EXTAL pin and undergoes waveform shaping by

PLL circuit 2 before being supplied inside the SH7708 Series. PLL circuit 1 is constantly on, and

there are no frequency range restrictions compared to mode 3. An input clock frequency of 8 MHz

to 60 MHz(SH7708, SH7708S) or 16 MHz to 60 MHz(SH7708R) can be used, and the CKIO

frequency range is 8 MHz to 60 MHz(SH7708, SH7708S) or 16 MHz to 60 MHz(SH7708R).

162

▷