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Subclock Oscillator Characteristics
(1) Crystal resonator (T
A
Recommended Circuit
Parameter
Oscillation
XT1
XT2
frequency (f
Oscillation
stabilization
Note 2
time
Notes 1. Indicates only oscillator characteristics.
2. Time required from when V
resonator stabilizes.
= −40 to +85°C, V
(2) External clock (T
A
Recommended Circuit
Parameter
Input frequency
XT1
XT2
Note
(f
)
XT
External clock
Note The duty ratio of the input waveform must be within 50% ±5%.
Cautions 1. When using the subclock 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 V
• Do not ground the capacitor to a ground pattern through which a high current flows.
• Do not fetch signals from the oscillator.
2. The subclock oscillator is designed as a low-amplitude circuit for reducing power consumption,
and is more prone to malfunction due to noise than the main clock oscillator. Particular care is
therefore required with the wiring method when the subclock is used.
Internal Oscillator Characteristics (T
Parameter
Internal oscillation frequency
= −40 to +85°C, V
PLL Characteristics (T
A
Parameter
Input frequency
Output frequency
Lock time
658
CHAPTER 28 ELECTRICAL SPECIFICATIONS
= −40 to +85°C, V
= 2.7 to 5.5 V, V
DD
Note 1
)
XT
reaches oscillation voltage range (2.7 V (MIN.)) to when the crystal
DD
= 2.7 to 5.5 V, V
DD
= −40 to +85°C, V
A
Symbol
Conditions
f
R
= 2.7 to 5.5 V, V
DD
Symbol
Conditions
f
X
f
XX
t
After V
reaches 2.7 V (MIN.)
PLL
DD
User's Manual U16896EJ2V0UD
= 0 V)
SS
Conditions
= 0 V)
SS
Conditions
= 2.7 to 5.5 V, V
= 0 V)
DD
SS
MIN.
120
= 0 V)
SS
MIN.
2
8
MIN.
TYP.
MAX.
Unit
32
32.768
35
kHz
10
s
MIN.
TYP.
MAX.
Unit
32
35
kHz
.
SS
TYP.
MAX.
Unit
240
480
kHz
TYP.
MAX.
Unit
5
MHz
20
MHz
μ
200
s
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