RL78 datasheet(46/100 Pages) RENESAS

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RL78/G14

2. ELECTRICAL SPECIFICATIONS

R01DS0053EJ0100 Rev. 1.00

Page 46 of 97

Feb 21, 2012

2.2.3

Subsystem clock oscillator characteristics

Note

Indicates only oscillator characteristics. Refer to AC Characteristics for instruction execution time.

Caution 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.

Caution 2. The XT1 oscillator is designed as a low-amplitude circuit for reducing power consumption, and is more prone to

malfunction due to noise than the X1 oscillator. Particular care is therefore required with the wiring method

when the XT1 clock is used.

Remark

For the resonator selection and oscillator constant, customers are requested to either evaluate the oscillation themselves

or apply to the resonator manufacturer for evaluation.

(TA = -40 to +85

C, 1.6 V  EVDD0 = EVDD1  5.5 V, VSS = EVSS0 = EVSS1 = 0 V)

Resonator

Recommended Circuit

Items

Conditions

MIN.

TYP.

MAX.

Unit

Crystal

resonator

XT1 clock oscillation frequency

(fXT) Note

32.768

kHz

XT1

XT2

VSS

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