NEC PD78052 User Manual page 167

Figure 7-8. Examples of Incorrect Oscillator Connection (2/2)
(c) Changing high current is too near a
signal conductor
IC X2
(e) Signals are fetched
IC X1
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. In Figure 7-8 (f), XT2 and X1 are wired in parallel. Thus, the cross-talk noise of X1 may
increase with XT2, resulting in malfunctioning. 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
CHAPTER 7 CLOCK GENERATOR
(d) Current flows through the grounding line
of the oscillator (potential at points A, B,
and C fluctuate)
X1
IC
High
Current
X2
.
SS
Pnm
X2 X1
A B C
High
Current
V
DD
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