APPENDIX D LIST OF CAUTIONS
User’s Manual U18172EJ2V0UD
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(15/15)
Chapter
Cl
assi
fi
cati
on
Function Details
of
Function
Cautions Page
Absolute
maximum
ratings
Product quality may suffer if the absolute maximum rating is exceeded even
momentarily for any parameter. That is, the absolute maximum ratings are rated
values at which the product is on the verge of suffering physical damage, and
therefore the product must be used under conditions that ensure that the absolute
maximum ratings are not exceeded.
p. 282
X1 oscillator
characteristics
When using the X1 oscillator, wire as follows in the area enclosed by the broken
lines in the above figures 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.
p. 283
Chapter 19
Hard
Electrical
specificati
ons
A/D converter
The conversion accuracy may be degraded if the level of a port that is not used
for A/D conversion is changed during A/D conversion.
p. 290
Lead-free
products
Products with -A at the end of the part number are lead-free products.
p. 295
For soldering methods and conditions other than those recommended below,
contact an NEC Electronics sales representative.
p. 295
Chapter 21
Hard
Recom-
mended
soldering
conditions
−
Do not use different soldering methods together (except for partial heating).
p. 295