
802
Chapter 27
Electrical Specification
User’s Manual U16702EE3V2UD00
27.5 Oscillator
Characteristics
27.5.1 General
condition
-40°C
≤
T
A
≤
+110°C (µPD70F3402)
-40°C
≤
T
A
≤
+85°C (µPD70F3403, µPD70F3403A)
V
SS0
=V
SS1
=AV
SS
=BV
SS
=0 V
4.0 V
≤
V
DD0
≤
V
DD1
≤
5.5 V
27.5.2 Oscillator timing and recommended oscillator connection
Notes: 1.
The on-chip oscillator starts its operation after the operating voltage is supplied to the sys-
tem independent of the state of the RESET signal. After release of the RESET signal, the
system applies a delay of 2
13
/fx before starting its operation. If this delay is not sufficient to
ensure proper and stable oscillation of an external resonator, the user needs to adjust the
active period of the RESET signal after applying the operating voltage to meet the stabiliza-
tion timing of the external resonator. Please contact the resonator manufacturer for details.
2.
The timing depends on the setting of the oscillation stabilization time (OSTS register).
Figure 27-1:
Recommended Oscillator Connection (Ceramic or Crystal Resonator)
Cautions: 1. Connect the oscillator as close to the X1 and X2 pins as possible.
2. Don’t write any other signal lines in the area indicated by broken lines.
3. For the resonator selection and oscillator constant, customers are required to
either evaluate the oscillation themselves or apply to the resonator manufacturer
for evaluation.
Parameter
Symbol
Condition
MIN.
TYP.
MAX.
Unit
Oscillation frequency
f
X
4
-
8
MHz
Oscillation stabilization
time
T
OST
After RESET
-
Note 1
-
ms
After STOP mode
0.5
Note 2
-
ms
X2
X1
C2
C1
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