Renesas RL78 Series User Manual page 154

RL78/G1D
Figure 6-13 shows examples of incorrect resonator connection.
(a) Too long wiring
(c) The X1 and X2 signal line wires cross.
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.
R01UH0515EJ0120 Rev.1.20
Dec 16, 2016
Figure 6-13. Examples of Incorrect Resonator Connection (1/2)
V X1 X2
SS
V X1 X2
SS
CHAPTER 6 CLOCK GENERATOR
(b) Crossed signal line
V X1
SS
NG
NG
NG
(d) A power supply/GND pattern exists
under the X1 and X2 wires.
V X1
SS
Note
Power supply/GND pattern
PORT
X2
X2
133