F24 datasheet(97/210 Pages) RENESAS

97 / 210 page

RL78/F23, F24

4. ELECTRICAL SPECIFICATIONS (GRADE 4)

R01DS0446EJ0120 Rev.1.20

Page 97 of 207

Dec 31, 2025

4.2 Oscillator Characteristics

4.2.1 Main System Clock Oscillator Characteristics

(TA = -40 to +125

°C, 2.7 V ≤ EVDD0 = EVDD1 = VDD ≤ 5.5 V, VSS = EVSS0 = EVSS1 = 0 V)

Resonator

Recommended Circuit

Parameter

Conditions

MIN.

TYP. MAX.

Unit

Ceramic resonator/

Crystal resonator

X1 clock oscillation frequency (fx)

2.7 V

≤ VDD ≤ 5.5 V

2.0

20.0

MHz

Cautions 1. When using the X1 oscillator, wire as follows in the area enclosed by the broken lines in the above

figures to avoid an adverse effect from wiring capacitance.

 Keep the wiring length as short as possible.

 Do not cross the wiring with the other signal lines.

 Do not route the wiring near a signal line through which a high fluctuating current flows.

 Always make the ground point of the oscillator capacitor the same potential as VSS.

 Do not ground the capacitor to a ground pattern through which a high current flows.

 Do not fetch signals from the oscillator.

2. Customers are requested to consult the resonator manufacturer to select an appropriate resonator

and to determine the proper oscillation constant. Customers are also requested to adequately

evaluate the oscillation on their system. Determine the X1 clock oscillation stabilization time using

the oscillation stabilization time of the oscillation stabilization time counter status register (OSTC)

and the oscillation stabilization time select register (OSTS) after sufficiently evaluating the

oscillation stabilization time with the resonator to be used.

VSS

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