MC80F0804D データシートの表示（PDF） - Unspecified

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MC80F0804D

8-BIT SINGLE-CHIP MICROCONTROLLERS

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MC80F0704/0708/0804/0808

21.2 Oscillation Fail Processor

The oscillation fail processor (OFP) can change the clock source

from external to internal oscillator when the oscillation fail oc-

curred. This function could be enabled or disabled by the “OFP”

bit of the Device Configuration Area (MASK option for

MC80F0704/0708/0804/0808.

And this function can recover the external clock source when the

external clock is recovered to normal state.

IN4(2)MCLK/CLKXO(XO) Option

The “IN4MCLK(XO)”, “IN2MCLK(XO)” bit of the Device

Configuration Area (MASK option for MC80F0704/0708/0804/

0808 enables the function to operate the device by using the in-

ternal oscillator clock in ONP block as system clock. There is no

need to connect the X-tal, resonator, RC and R externally. The

user only to connect the XIN pin to VDD. After selecting the this

option, the period of internal oscillator clock could be checked by

XOUT outputting clock divided the internal oscillator clock by 4.

100

October 31, 2011 Ver 1.03

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