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RL78/G1A CHAPTER 5 CLOCK GENERATOR
R01UH0305EJ0200 Rev.2.00 160
Jul 04, 2013
Figure 5-13 shows examples of incorrect resonator connection.
Figure 5-13. Examples of Incorrect Resonator Connection (1/2)
(a) Too long wiring (b) Crossed signal line
X2V
SS
X1 X1
NG
NG
NG
V
SS
X2
PORT
(c) The X1 and X2 signal line wires cross. (d) A power supply/GND pattern exists
under the X1 and X2 wires.
X2V
SS
X1
X1
Power supply/GND pattern
V
SS
X2
Note
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.