R8CSLASH2G datasheet(107/344 Pages) RENESAS

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R8C/2G Group

11. Clock Generation Circuit

Rev.1.00

Apr 04, 2008

Page 87 of 318

REJ09B0387-0100

11. Clock Generation Circuit

The clock generation circuit has:

• XCIN clock oscillation circuit

• Low-speed on-chip oscillator

• High-speed on-chip oscillator

Table 11.1 lists Specifications of Clock Generation Circuit. Figure 11.1 shows a Clock Generation Circuit. Figures 11.2

to 11.8 show clock associated registers. Figure 11.9 shows a Handling Procedure of Internal Power Low Consumption

Using VCA20 Bit.

NOTES:

1. These pins can be used as P4_3 or P4_4 when using the on-chip oscillator clock as the CPU clock while the

XCIN clock oscillation circuit is not used.

2. Set the CM04 bit in the CM0 register to 1 (XCIN-XCOUT pin) when an external clock is input.

Table 11.1

Specifications of Clock Generation Circuit

Item

XCIN Clock Oscillation Circuit

On-Chip Oscillator

High-Speed On-Chip Oscillator Low-Speed On-Chip Oscillator

Applications

• CPU clock source

• Peripheral function clock

source

• CPU clock source

• Peripheral function clock

source

• CPU clock source

• Peripheral function clock

source

Clock frequency 32.768 kHz

Approx. 8 MHz

Approx. 125 kHz

Connectable

oscillator

• Crystal oscillator

−−

Oscillator

connect pins

XCIN, XCOUT(1)

−(1)

Oscillation stop,

restart function

Usable

Oscillator status

after reset

Oscillate

Stop

Oscillate

Others

• Externally generated clock can

be input(2)

• On-chip feedback resistor

RfXCIN (connected/ not

connected, selectable)

−−

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