CHAPTER 23 ELECTRICAL SPECIFICATIONS (TARGET)
Preliminary User’s Manual U16846EJ1V0UD
372
Crystal/ceramic Oscillator Characteristics
(T
A
=
−
40 to +85
°
C, 2.7 V
≤
V
DD
≤
5.5 V, 2.7 V
≤
AV
REF
≤
V
DD
, V
SS
= AV
SS
= 0 V)
Resonator Recommended
Circuit Parameter
Conditions MIN.
TYP.
MAX.
Unit
4.0 V
≤
V
DD
≤
5.5 V
2.0
16
3.3 V
≤
V
DD
< 4.0 V
2.0
8.38
Ceramic resonator
C1
X2
X1
V
SS
C2
Oscillation frequency
(f
XP
)
Note
2.7 V
≤
V
DD
< 3.3 V
2.0
5.0
MHz
4.0 V
≤
V
DD
≤
5.5 V
2.0
16
3.3 V
≤
V
DD
< 4.0 V
2.0
8.38
Crystal resonator
C1
X2
X1
V
SS
C2
Oscillation frequency
(f
XP
)
Note
2.7 V
≤
V
DD
< 3.3 V
2.0
5.0
MHz
4.0 V
≤
V
DD
≤
5.5 V
2.0
16
3.3 V
≤
V
DD
< 4.0 V
2.0
8.38
X1 input frequency
(f
XP
)
Note
2.7 V
≤
V
DD
< 3.3 V
2.0
5.0
MHz
4.0 V
≤
V
DD
≤
5.5 V
30
500
3.3 V
≤
V
DD
< 4.0 V
56
500
External clock
X2
X1
X1 input high-/low-
level width (t
XH
, t
XL
)
2.7 V
≤
V
DD
< 3.3 V
96
500
ns
Note Indicates
only
oscillator
characteristics. Refer to AC Characteristics for instruction execution time.
Cautions 1. When using the crystal/ceramic 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. Since the CPU is started by the Ring-OSC after reset is released, check the oscillation
stabilization time of the crystal/ceramic oscillation clock using the oscillation stabilization time
status register (OSTC). Determine the oscillation stabilization time of the OSTC register and
oscillation stabilization time select register (OSTS) after sufficiently evaluating the oscillation
stabilization time with the resonator to be 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.
