CHAPTER 28 ELECTRICAL SPECIFICATIONS
User’s Manual U16896EJ2V0UD
658
Subclock Oscillator Characteristics
(1) Crystal resonator (T
A
=
−
40 to +85
°
C, V
DD
= 2.7 to 5.5 V, V
SS
= 0 V)
Recommended Circuit
Parameter
Conditions
MIN.
TYP.
MAX.
Unit
Oscillation
frequency (f
XT
)
Note 1
32
32.768
35
kHz
XT2
XT1
Oscillation
stabilization
time
Note 2
10
s
Notes 1.
Indicates only oscillator characteristics.
2.
Time required from when V
DD
reaches oscillation voltage range (2.7 V (MIN.)) to when the crystal
resonator stabilizes.
(2) External clock (T
A
=
−
40 to +85
°
C, V
DD
= 2.7 to 5.5 V, V
SS
= 0 V)
Recommended Circuit
Parameter
Conditions
MIN.
TYP.
MAX.
Unit
External clock
XT2
XT1
Input frequency
(f
XT
)
Note
32
35
kHz
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
SS
.
• 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
A
=
−
40 to
+
85
°
C, V
DD
= 2.7 to 5.5 V, V
SS
= 0 V)
Parameter Symbol
Conditions
MIN.
TYP.
MAX.
Unit
Internal oscillation frequency
f
R
120
240
480
kHz
PLL Characteristics (T
A
=
−
40 to
+
85
°
C, V
DD
= 2.7 to 5.5 V, V
SS
= 0 V)
Parameter Symbol
Conditions
MIN.
TYP.
MAX.
Unit
Input frequency
f
X
2 5
MHz
Output frequency
f
XX
8 20
MHz
Lock time
t
PLL
After
V
DD
reaches 2.7 V (MIN.)
200
μ
s
Содержание ?PD703302
Страница 2: ...User s Manual U16896EJ2V0UD 2 MEMO ...