CHAPTER 5 CLOCK GENERATOR
Preliminary User’s Manual U19014EJ1V0UD
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5.4.2 Internal high-speed oscillator
An internal high-speed oscillator is incorporated in the
µ
PD78F0730. Oscillation can be controlled by the internal
oscillation mode register (RCM).
After a reset release, the internal high-speed oscillator automatically starts oscillation (16 MHz (TYP.)).
5.4.3 Internal low-speed oscillator
An internal low-speed oscillator is incorporated in the
µ
PD78F0730.
The internal low-speed oscillation clock is only used as the watchdog timer and the clock of 8-bit timer H1. The
internal low-speed oscillation clock cannot be used as the CPU clock.
“Can be stopped by software” or “Cannot be stopped” can be selected by the option byte. When “Can be stopped
by software” is set, oscillation can be controlled by the internal oscillation mode register (RCM).
After a reset release, the internal low-speed oscillator automatically starts oscillation, and the watchdog timer is
driven (240 kHz (TYP.)) if the watchdog timer operation is enabled using the option byte.
5.4.4 Prescaler
The prescaler generates various clocks by dividing the main system clock when the main system clock is selected
as the clock to be supplied to the CPU.
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