R5F2L3ACBNFP datasheet(162/848 Pages) RENESAS

162 / 848 page

REJ09B0441-0010 Rev.0.10

Jul 30, 2008

Page 126 of 809

Under development Preliminary specification

Specifications in this manual are tentative and subject to change.

9. Clock Generation Circuit

R8C/L35A Group, R8C/L36A Group, R8C/L38A Group, R8C/L3AA Group,

R8C/L35B Group, R8C/L36B Group, R8C/L38B Group, R8C/L3AB Group

Clock Generation Circuit

The following five circuits are incorporated in the clock generation circuit:

• XIN clock oscillation circuit

• XCIN clock oscillation circuit

• Low-speed on-chip oscillator

• High-speed on-chip oscillator

• Low-speed on-chip oscillator for the watchdog timer

9.1

Introduction

Table 9.1 lists the Specification Overview of Clock Generation Circuit. Figure 9.1 shows the Clock Generation

Circuit and Figure 9.2 shows the Peripheral Function Clock.

Notes:

1. These pins can be used as P12_0 and P12_1 when using the on-chip oscillator clock as the CPU clock while

the XIN clock oscillation circuit and the XCIN clock oscillation circuit are not used.

2. To input an external clock, set the CM05 bit in the CM0 register to 1 (XIN clock stops), the CM11 bit in the CM1

3. The clock frequency is set to up to 20 MHz by a divider when using the high-speed on-chip oscillator as the

CPU clock source.

4. This applies when the CSPROINI bit in the OFS register is set to 1 (count source protection mode disabled after

reset).

5. This applies when the CSPROINI bit in the OFS register is set to 0 (count source protection mode enabled after

reset).

Table 9.1

Specification Overview of Clock Generation Circuit

Item

XIN Clock

Oscillation Circuit

XCIN Clock

Oscillation Circuit

On-Chip Oscillator

Low-Speed

On-Chip Oscillator

for Watchdog Timer

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

• CPU and

peripheral

function clock

source when XIN

clock stops

oscillating

• CPU clock

source

• Peripheral

function clock

source

• CPU and

peripheral

function clock

source when XIN

clock stops

oscillating

• Watchdog timer

clock source

Clock frequency 0 to 20 MHz

32.768 kHz

Approx. 40 MHz (3) Approx. 125 kHz

Approx. 125 kHz

Connectable

oscillator

•Ceramic

resonator

• Crystal

oscillator

• Crystal

oscillator

−−−

Oscillator

connect pins

XIN, XOUT (1)

XCIN, XCOUT

− (1)

−

Oscillation stop,

restart function

Usable

Oscillator status

after reset

Stop

Oscillate

Stop

Oscillate

Stop (4)

Oscillate (5)

Others

Externally

generated clock

can be input (2)

• Externally

generated clock

can be input

• On-chip

feedback

resistor Rf

(connected/

not connected

selectable)

−−−

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