CHAPTER 30 ELECTRICAL SPECIFICATIONS ((A1) GRADE PRODUCTS)
User’s Manual U16228EJ2V0UD
489
X1 Oscillator Characteristics
(T
A
=
40 to +110
°
C
Note 1
, 3.3 V
≤
V
DD
= EV
DD
≤
5.5 V, 3.3 V
≤
AV
REF
≤
V
DD
, V
SS
= EV
SS
= AV
SS
= 0 V)
Resonator
Recommended Circuit
Parameter
Conditions
MIN.
TYP.
MAX.
Unit
4.5 V
≤
V
DD
≤
5.5 V
2.0
10
4.0 V
≤
V
DD
< 4.5 V
2.0
8.38
Ceramic
resonator
Note 2
C1
X2
X1
V
SS
C2
Oscillation frequency (f
XP
)
Note 3
3.3 V
≤
V
DD
< 4.0 V
2.0
5.0
MHz
4.5 V
≤
V
DD
≤
5.5 V
2.0
10
4.0 V
≤
V
DD
< 4.5 V
2.0
8.38
Crystal
resonator
Note 2
C1
X2
X1
V
SS
C2
Oscillation frequency (f
XP
)
Note 3
3.3 V
≤
V
DD
< 4.0 V
2.0
5.0
MHz
4.5 V
≤
V
DD
≤
5.5 V
2.0
10
4.0 V
≤
V
DD
< 4.5 V
2.0
8.38
X1 input frequency (f
XP
)
Note 3
3.3 V
≤
V
DD
< 4.0 V
2.0
5.0
MHz
4.5 V
≤
V
DD
≤
5.5 V
46
500
4.0 V
≤
V
DD
< 4.5 V
56
500
External
clock
Note 2
X2
X1
X1 input high-/low-level width
(t
XPH
, t
XPL
)
3.3 V
≤
V
DD
< 4.0 V
96
500
ns
Notes 1.
T
A
=
40 to +110
°
C:
μ
PD780131(A1), 780132(A1), 780133(A1), 780134(A1), 780136(A1), 780138(A1)
T
A
=
40 to +105
°
C:
μ
PD78F0134(A1), 78F0138(A1)
2.
Connect the REGC pin directly to V
DD
.
3.
Indicates only oscillator characteristics. Refer to
AC Characteristics
for instruction execution time.
Cautions 1. When using the X1 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 X1 input 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, users are required to either evaluate the oscillation
themselves or apply to the resonator manufacturer for evaluation.