MC80F0204 Datasheet, PDF (105/126 Pages) List of Unclassifed Manufacturers – 8-BIT SINGLE-CHIP MICROCONTROLLERS

Preliminary
MC80F0104/0204
22.2 Oscillation Fail Processor
The oscillation fail processor (OFP) can change the clock
source from external to internal oscillator when the oscil-
lation fail occured. This function could be enabled or dis-
abled by the “OFP” bit of the Device Configuration Area
(MASK option for MC80C0104/0204).
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 De-
vice Configuration Area (MASK option for MC80C0104/
0204) enables the function to operate the device by using
the internal 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 X_IN pin to V_DD.
After selecting the this option, the period of internal oscil-
lator clock could be checked by X_OUT outputting clock di-
vided the internal oscillator clock by 4.
Mar. 2005 Ver 0.2
101