
CHAPTER 30 ELECTRICAL SPECIFICATIONS ((A) GRADE PRODUCTS)
User’s Manual U17260EJ6V0UD
637
(A) grade products
Internal Oscillator Characteristics
(TA =
40 to +85°C, 1.8 V ≤ VDD = EVDD ≤ 5.5 V, VSS = EVSS = AVSS = 0 V)
Resonator
Parameter
Conditions
MIN.
TYP.
MAX.
Unit
2.7 V
≤ VDD ≤ 5.5 V
7.6
8.0
8.4
MHz
RSTS = 1
1.8 V
≤ VDD < 2.7 V
7.6
8.0
10.4
MHz
8 MHz internal oscillator
Internal high-speed
oscillation clock frequency
(fRH)
Note 1
RSTS = 0
2.48
5.6
9.86
MHz
2.7 V
≤ VDD ≤ 5.5 V
216
240
264
kHz
240 kHz internal oscillator
Internal low-speed
oscillation clock frequency
(fRL)
1.8 V
≤ VDD < 2.7 V
192
240
264
kHz
Note
Indicates only oscillator characteristics. Refer to AC Characteristics for instruction execution time.
Remark RSTS: Bit 7 of the internal oscillation mode register (RCM))
XT1 Oscillator Characteristics
(TA =
40 to +85°C, 1.8 V ≤ VDD = EVDD ≤ 5.5 V, VSS = EVSS = AVSS = 0 V)
Resonator
Recommended Circuit
Parameter
Conditions
MIN.
TYP.
MAX.
Unit
Crystal
resonator
XT1
VSS XT2
C4
C3
Rd
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 figure 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.
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.
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