HD64F3437TF16 Datasheet, PDF (121/752 Pages) Hitachi Semiconductor – 12 V must not be applied to the S-mask model (single-power-supply specification), as this may permanently damage the device.

XTAL
C_L
L
Rs
EXTAL
C₀
AT-cut parallel resonating crystal
Figure 6.3 Equivalent Circuit of External Crystal
Table 6.2 External Crystal Parameters
Frequency (MHz)
Rs max (Ω)
C₀ (pF)
2
4
8
10
12
16
500
120
80
70
60
50
7 pF max 7 pF max 7 pF max 7 pF max 7 pF max 7 pF max
Use a crystal with the same frequency as the desired system clock frequency (ø).
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 6.4. 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
C_L2
XTAL
EXTAL
C_L1
Figure 6.4 Notes on Board Design around External Crystal
92