R8C datasheet(32/199 Pages) RENESAS

Nome de Peças	R8C

Descrição Electrónicos	RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER

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R8C/10 Group

Rev.1.20 Jan 27, 2006

page 22 of 180

REJ09B0019-0120

6.2 On-Chip Oscillator Clock

This clock, approximately 125 kHz, is supplied by the on-chip oscillator. This clock is used as the clock

source for the CPU clock, peripheral function clock, fRING, and fRING128.

After reset, the on-chip oscillator clock divided by 8 is selected for the CPU clock.

To use the main clock for the CPU clock, set the OCD2 in the OCD register to “0” (selecting main clock)

after the main clock becomes oscillating stably. If the main clock stops oscillating when the OCD1 to

OCD0 bits in the OCD register is “112” (oscillation stop detection function enabled), the on-chip oscillator

automatically starts operating, supplying the necessary clock for the microcomputer.

The frequency of the on-chip oscillator varies depending on the supply voltage and the operation ambient

temperature. The application products must be designed with sufficient margin for the frequency change.

6.2 On-chip Oscillator Clock

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