CHAPTER 16 ELECTRICAL SPECIFICATIONS
638
User’s Manual U15195EJ5V0UD
Clock Oscillator Characteristics
(T
A
= –40 to +85
°
C, REGIN = 3.0 to 3.6 V, V
DD
= RV
DD
= 5.0 V
±
0.5 V, V
SS3
= V
SS
= CV
SS
= 0 V)
(a) Ceramic resonator or crystal resonator connection
X2
R
d
C2
C1
X1
Parameter Symbol
Conditions
MIN.
TYP.
MAX.
Unit
Oscillation frequency
f
X
4 6.4
MHz
Remarks 1.
Connect the oscillator as close to the X1 and X2 pins as possible.
2.
Do not wire any other signal lines in the area indicated by the 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.
(b) External clock input
Open
External clock
High-speed CMOS inverter
X2
X1
Cautions 1. Connect the high-speed CMOS inverter as close to the X1 pin as possible.
2. Thoroughly evaluate the matching between the V850E/IA2 and the high-speed CMOS
inverter.
3. When an internal regulator is used, the external clock must not be used.
This is because a malfunction may occur if the 3.3 V system voltage supplied by the
internal regulator and the voltage of the external clock differ in potential.
When using an external clock, do not use the internal regulator and externally
supply the REGIN pin with a 3.3 V system voltage of the same potential as the
external clock.
Содержание PD703114
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