Hardware manual

Rev. 3.0, 09/98, page 79 of 361
③③ Note on Board Design: When an external crystal is connected, other signal lines should be
kept away from the crystal circuit to prevent induction from interfering with correct oscillation.
See figure 5.4. The crystal and its load capacitors should be placed as close as possible to the
XTAL and EXTAL pins.
Not allowed
Signal A Signal B
H8/337
XTAL
EXTAL
C
L1
C L2
(Example of H8/337)
Figure 5.4 Notes on Board Design around External Crystal