CHAPTER 5 CLOCK GENERATORS
Preliminary User’s Manual U16898EJ1V0UD
68
STOP mode is released
Voltage
waveform
of X1 pin
a
Caution 3. The oscillation stabilization time that elapses on power application or after release of reset is
selected by the option byte. For details, refer to CHAPTER 17 OPTION BYTE.
Remarks 1. ( ): f
X
= 10 MHz
2. Determine the oscillation stabilization time of the resonator by checking the characteristics of the
resonator to be used.
5.4 System
Clock
Oscillators
The following three types of system clock oscillators are available.
•
High-speed Ring-OSC oscillator: Internally oscillates a clock of 8 MHz (TYP.).
•
Crystal/ceramic oscillator:
Oscillates a clock of 500 kHz to 10 MHz.
•
External clock input circuit:
Supplies a clock of 500 kHz to 10 MHz to the X1 pin.
5.4.1 High-speed
Ring-OSC oscillator
The 78K0S/KA1+ includes a high-speed Ring-OSC oscillator (8 MHz (TYP.)).
If the high-speed Ring-OSC is selected by the option byte as the clock source, the X1 and X2 pins can be used as
I/O port pins.
For details of the option byte, refer to CHAPTER 17 OPTION BYTE. For details of I/O ports, refer to CHAPTER 4
PORT FUNCTIONS.
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