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5.4.4 Example of incorrect resonator connection
Figure 5-8 shows an example of incorrect connection for crystal/ceramic oscillation and Figure 5-9 shows an
example for RC oscillation.
Figure 5-8. Examples of Incorrect Connection for Crystal/Ceramic Oscillation (1/2)
(a) Too long wiring
V
SS
(c) Wiring near high fluctuating current
V
X1
SS
Remark
When using the subsystem clock, read X1 and X2 as XT1 and XT2, respectively, and connect a resistor
to XT2 in series.
110
CHAPTER 5 CLOCK GENERATOR
X1
X2
X2
High current
User's Manual U15075EJ2V1UD
(b) Crossed signal line
(n = 0 to 3, 5 to 9)
V
SS
(d) Current flowing through ground line of oscillator
(potential at points A, B, and C fluctuates)
P
V
X1
X2
SS
A
B
C
High current
PORTn
X1
X2
V
mn
DD
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