RL78/F13, F14 CHAPTER 35 ELECTRICAL SPECIFICATIONS (GRADE K)
R01UH0368EJ0210 Rev.2.10 1733
Dec 10, 2015
35.2 Oscillator Characteristics
35.2.1 Main System Clock Oscillator Characteristics
(TA = -40 to +125C, 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 1.0 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 V
SS.
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.
C1
X2X1
C2
V
SS
Rd
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