HD6473258CP10 Datasheet, PDF (235/301 Pages) Renesas Technology Corp – Hitachi Single-Chip Microcomputer

EXTAL
XTAL
CL1
CL2
CL1 = CL2 = 15 to 22 pF
Figure 14-2. Connection of Crystal Oscillator (Example)
 Crystal Oscillator: The external crystal should have the characteristics listed in table 16-1.
Table 14-1. External Crystal Parameters
Frequency (MHz) 2
4
8
12
Rs max (Ω)
500 120 60
40
C0 (pF)
7 pF max
Fig 14-2
16
20
30
20
XTAL
CL
L
RS
EXTAL
C0
AT-cut parallel resonating crystal
Figure 14-3. Equivalent Circuit of External Crystal
Ž 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 14-4. The crystal and its load capacitors should be placed as close as possible to the
XTAL and EXTAL pins.
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