R5F211B2DSP datasheet(74/339 Pages) RENESAS

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R8C/1A Group, R8C/1B Group

10. Clock Generation Circuit

Rev.1.30

Dec 08, 2006

Page 58 of 315

REJ09B0252-0130

10. Clock Generation Circuit

The clock generation circuit has:

• Main clock oscillation circuit

• On-chip oscillator (oscillation stop detection function)

Table 10.1 lists Specifications of Clock Generation Circuit. Figure 10.1 shows a Clock Generation Circuit. Figures 9.2

to 10.5 show clock associated registers.

NOTE:

1. These pins can be used as P4_6 or P4_7 when using the on-chip oscillator clock as the CPU clock

while the main clock oscillation circuit is not used.

Table 10.1

Specifications of Clock Generation Circuit

Item

Main 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 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 20 MHz

Approx. 8 MHz

Approx. 125 kHz

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

−−

R5F211B2DSP Datasheet(PDF) 74 Page - Renesas Technology Corp

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