CHAPTER 20 ELECTRICAL SPECIFICATIONS
User’s Manual U13850EJ6V0UD
603
Recommended Oscillator
(1) Main clock oscillator (T
A
= –40 to +85°C)
(a) Connection of ceramic resonator or crystal resonator
X2
X1
C2
Rf
Rd
C1
Parameter
Symbol
Conditions
MIN.
TYP.
MAX.
Unit
Oscillation frequency
(V850/SB1)
f
XX
2
20
MHz
Oscillation frequency
(H versions of V850/SB2)
f
XX
2
19
MHz
Oscillation frequency
(A and B versions of
V850/SB2)
f
XX
2
13
MHz
–
Upon reset release
2
19
/f
XX
s
Oscillation stabilization time
–
Upon STOP mode release
Note
s
Note
The TYP. value differs depending on the setting of the oscillation stabilization time select register (OSTS).
Cautions 1. The main clock oscillator operates on the output voltage of the on-chip regulator (3.0 V/3.3 V
(for details, refer to CHAPER 16 REGULATOR). External clock input is prohibited.
2. When using the main clock 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.
3. Ensure that the duty of oscillation waveform is between 5.5 and 4.5.
4. Sufficiently evaluate the matching between the V850/SB1 and V850/SB2 devices and the
resonator.
Содержание V850/SB1
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