R8CSLASH15 datasheet(50/277 Pages) RENESAS

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R8C/14 Group, R8C/15 Group

9. Clock Generation Circuit

Rev.2.10

Jan 19, 2006

Page 38 of 253

REJ09B0164-0210

Clock Generation Circuit

The MCU has two on-chip clock generation circuits:

• Main clock oscillation circuit

• On-chip oscillator (oscillation stop detection function)

Table 9.1 lists Specification of Clock Generation Circuit. Figure 9.1 shows a Clock Generation Circuit.

Figures 9.2 to 9.5 show clock-associated registers.

NOTES:

1. This pin can be used as P4_6 and P4_7 when using the on-chip oscillator clock for a CPU clock

while the main clock oscillation circuit is not used.

Table 9.1

Specification of Clock Generation Circuit

Item

Main Clock

Oscillation Circuit

On-Chip Oscillator

High-Speed On-Chip Oscillator

Low-Speed On-Chip Oscillator

Use of Clock

• CPU clock source

• Peripheral

function clock

source

• CPU clock source

• Peripheral function clock

source

• CPU and peripheral function

clock sources when main

clock stops oscillating

• CPU clock source

• Peripheral function clock

source

• CPU and peripheral function

clock sources when main

clock stops oscillating

Clock Frequency 0 to 20MHz

Approx. 8MHz

Approx. 125kHz

Connectable

Oscillator

•Ceramic

resonator

• Crystal oscillator

−−

Oscillator

Connect Pins

XIN, XOUT(1)

(Note 1)

Oscillation Stop,

Restart Function

Usable

Oscillator Status

After Reset

Stop

Oscillate

Others

Externally

generated clock

can be input

−−

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