CHAPTER 20 ELECTRICAL SPECIFICATIONS
User’s Manual U13850EJ6V0UD
605
(2) Subclock oscillator (T
A
= –40 to +85°C)
(a) Connection of crystal resonator
XT1
XT2
Parameter
Symbol
Conditions
MIN.
TYP.
MAX.
Unit
Oscillation frequency
f
XT
32
32.768
35
kHz
Oscillation stabilization time
–
10
s
Cautions 1. The subclock oscillator operates on the output voltage of the on-chip regulator (3.0 V/3.3 V
(for details, refer to CHAPTER 16 REGULATOR)).
External clock input is prohibited.
2. 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.
3. Sufficiently evaluate the matching between the V850/SB1 and V850/SB2 devices and the
resonator.
Содержание V850/SB1
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