UPD78F0138 NEC, UPD78F0138 Datasheet - Page 128

• Manufacturer Part Number: UPD78F0138
• Description: (UPD78xxxx) 8-Bit Single-Chip Microcontrollers
• Manufacturer: NEC

CHAPTER 5 CLOCK GENERATOR
Figure 5-10. Examples of Incorrect Resonator Connection (2/2)
(c) Wiring near high alternating current
(d) Current flowing through ground line of oscillator
(potential at points A, B, and C fluctuates)
V
DD
Pmn
V
X1
X2
SS
V
X1
X2
SS
A
B
C
High current
(e) Signals are fetched
V
X1
X2
SS
Remark When using the 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 crosstalk noise of X2 may increase with XT1,
resulting in malfunctioning.
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User’s Manual U16228EJ2V0UD