UPD78F1502AGK-GAK-AX Datasheet, PDF (241/1031 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcontrollers

78K0R/Lx3
CHAPTER 5 CLOCK GENERATOR
Figure 5-12. Examples of Incorrect Resonator Connection (2/2)
(e) Wiring near high alternating current
(f) Current flowing through ground line of oscillator
(potential at points A, B, and C fluctuates)
VDD
VSS
X1
X2
VSS
X1
Pmn
X2
(g) Signals are fetched
A
B
C
High current
VSS
X1
X2
Remark When using the subsystem clock, replace X1 and X2 with XT1 and XT2, respectively. Also, insert resistors
in series on the XT2 side.
Caution 2. When X2 and XT1 are wired in parallel, the crosstalk noise of X2 may increase with XT1, resulting
in malfunctioning.
R01UH0004EJ0501 Rev.5.01
225
Jun 20, 2011