NEC mPD780065 Series Preliminary User's Manual page 96

Figure 5-6. Examples of Incorrect Oscillator Connection (2/2)
(c) Wiring near high alternating current
IC X1
V
SS1
(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. When X2 and XT1 are wired in parallel, the cross-talk noise of X2 may increase with XT1,
resulting in malfunctioning.
To prevent that from occurring, it is recommended to wire X2 and XT1 so that they are not
in parallel, and to connect the IC pin between X2 and XT1 directly to V
96
CHAPTER 5 CLOCK GENERATOR
(d) Current flowing through ground line of
X2
V
SS1
IC X1
V
SS1
Preliminary User's Manual U13420EJ2V0UM00
oscillator (potential at points A, B, and
C fluctuates)
Pmn
IC X1 X2
A B C
High current
X2
V
DD0
.
SS1