
CHAPTER 30 ELECTRICAL SPECIFICATIONS ((A) GRADE PRODUCTS)
User’s Manual U18417EJ4V0UD
845
(A) Grade Products
XT1 Oscillator Characteristics
(TA =
40 to +85°C, 1.8 V ≤ VDD = EVDD0 = EVDD1 ≤ 5.5 V, VSS = EVSS0 = EVSS1 = AVSS = 0 V)
Resonator
Recommended
Circuit
Items
Conditions
MIN.
TYP.
MAX.
Unit
Crystal resonator
XT1
XT2
C4
C3
Rd
VSS
XT1 clock oscillation
frequency (fXT)
Note
32
32.768
35
kHz
Note Indicates only oscillator characteristics. Refer to AC Characteristics for instruction execution time.
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.
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.
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