CHAPTER 29 ELECTRICAL SPECIFICATIONS
User’s Manual U16899EJ2V0UD
474
High-Speed System Clock (Crystal/Ceramic) Oscillator Characteristics
(T
A
=
−
40 to +85
°
C, 2.5 V
≤
V
DD
= EV
DD
≤
5.5 V, 2.5 V
≤
AV
REF
≤
V
DD
, V
SS
= EV
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
3.5 V
≤
V
DD
< 4.0 V
2.0
10
3.0 V
≤
V
DD
< 3.5 V
2.0
8.38
Ceramic
resonator
C1
X2
X1
V
SS
C2
Oscillation
frequency (f
XP
)
Note
2.5 V
≤
V
DD
< 3.0 V
2.0
5.0
MHz
4.0 V
≤
V
DD
≤
5.5 V
2.0
16
3.5 V
≤
V
DD
< 4.0 V
2.0
10
3.0 V
≤
V
DD
< 3.5 V
2.0
8.38
Crystal
resonator
C1
X2
X1
V
SS
C2
Oscillation
frequency (f
XP
)
Note
2.5 V
≤
V
DD
< 3.0 V
2.0
5.0
MHz
4.0 V
≤
V
DD
≤
5.5 V
2.0
16
3.5 V
≤
V
DD
< 4.0 V
2.0
10
3.0 V
≤
V
DD
< 3.5 V
2.0
8.38
X1 input
frequency (f
XP
)
Note
2.5 V
≤
V
DD
< 3.0 V
2.0
5.0
MHz
4.0 V
≤
V
DD
≤
5.5 V
30
250
3.5 V
≤
V
DD
< 4.0 V
46
250
3.0 V
≤
V
DD
< 3.5 V
56
250
External
clock
X2
X1
X1 input high-
/low-level width
(t
XPH
, t
XPL
)
2.5 V
≤
V
DD
< 3.0 V
96
250
ns
Note Indicates
only
oscillator
characteristics. Refer to AC Characteristics for instruction execution time.
Cautions 1. When using the high-speed system clock 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, check the oscillation stabilization time of
the high-speed system clock using the oscillation stabilization time counter 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.