NEC mPD789426 Series, User Manual

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CHAPTER 5 CLOCK GENERATOR
110
User’s Manual U15075EJ1V0UM00
Figure 5-7. Examples of Incorrect Resonator Connection (1/2)
(a) Too long wiring (b) Crossed signal line
V
SS
X1 X2
V
SS
X1 X2
PORTn
(n = 0 to 3, 5)
(c) Wiring near high fluctuating current (d) Current flowing through ground line of oscillator
(potential at points A, B, and C fluctuates)
V
SS
X1 X2
High current
V
SS
X1
A B C
P
mn
V
DD
High current
X2
Remark When using the subsystem clock, read X1 and X2 as XT1 and XT2, respectively, and connect a
resistor to XT2 in series.