RL78/G1H CHAPTER 6 CLOCK GENERATOR
R01UH0575EJ0120 Rev. 1.20 Page 119 of 920
Dec 22, 2016
Figure 6 - 16 shows examples of incorrect resonator connection.
Figure 6 - 16 Examples of Incorrect Resonator Connection (1/2)
Note Do not place a power supply/GND pattern under the wiring section (section indicated by a broken line in the figure) of the
X1 and X2 pins and the resonators in a multi-layer board or double-sided board.
Do not configure a layout that will cause capacitance elements and affect the oscillation characteristics.
Remark When using the subsystem clock, replace X1 and X2 with XT1 and XT2, respectively. Also, insert resistors in series on
the XT2 side.
(a) Too long wiring (b) Crossed signal line
X2
V
SS
X1 X1
NG
NG
NG
X2
PORT
VSS
(c) The X1 and X2 signal line wires cross. (d) A power supply/GND pattern exists under the X1 and X2 wires.
Power supply/GND pattern
Note
X2V
SS X1
X2V
SS X1
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