NEC UPD789426 Series User Manual page 111

CHAPTER 5 CLOCK GENERATOR
Figure 5-8. Examples of Incorrect Connection for Crystal/Ceramic Oscillation (2/2)
(e) Signal is fetched
V X1 X2
SS
Remark When using the subsystem clock, read X1 and X2 as XT1 and XT2, respectively, and connect a resistor
to XT2 in series.
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User's Manual U15075EJ2V1UD