NEC PD78058FY(A) - Manual (Page 163)

163
CHAPTER 7 CLOCK GENERATOR
Figure 7-8. Examples of Resonator with Incorrect Connection (2/2)
(c) Changing high current is too near a (d) Current flows through the grounding line
signal line of the resonator (potential at points A, B,
and C fluctuate)
(e) Signals are fetched
Remark When using a subsystem clock, replace X1 and X2 with XT1 and XT2, respectively. Also, insert resistors
in series on the XT2 side.
Cautions 2. If XT2 and X1 are wired in parallel, the crosstalk noise of X1 may be transmitted along XT2
and cause malfunctions. To prevent that from occurring, it is recommended to wire XT2
and X1 so that they are not in parallel, and to correct the IC pin between XT2 and X1 directly
to V SS .
X2 IC X1 X2 IC X1
Pnm
AV DD
A B C
High
Current
High
Current
X2 IC X1