RL78 datasheet(39/146 Pages) RENESAS

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RL78/F15

3. ELECTRICAL SPECIFICATIONS (GRADE L)

R01DS0461EJ0110 Rev.1.10

Page 39 of 143

Jan 30, 2026

3.2.3 Subsystem Clock Oscillator Characteristics

(TA = -40 to +105

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

Resonator

Recommended

Circuit

Item

Conditions

MIN.

TYP.

MAX.

Unit

Crystal resonator

XT1 clock oscillation frequency

(fXT)

2.7 V

≤ VDD ≤ 5.5 V

29.0

32.768

35.0

kHz

Cautions 1. When using the XT1 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.

The XT1 oscillator is designed as a low-amplitude circuit for reducing power

consumption and thus required to be adequately evaluated on the system. Customers

are requested to consult the resonator manufacturer to select an appropriate resonator

and to determine the proper oscillation constant.

XT2

XT1

VSS

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