HD6432351 Datasheet, PDF (680/989 Pages) Renesas Technology Corp – The H8S/2000 CPU has an internal 32-bit architecture, is provided with sixteen 16-bit general registers and a concise

19.3 Oscillator
Clock pulses can be supplied by connecting a crystal resonator, or by input of an external clock.
19.3.1 Connecting a Crystal Resonator
Circuit Configuration: A crystal resonator can be connected as shown in the example in figure
19-2. Select the damping resistance R_d according to table 19-2. An AT-cut parallel-resonance
crystal should be used.
C_L1
EXTAL
XTAL
R_d
C_L2
C_L1 = C_L2 = 10 to 22pF
Figure 19-2 Connection of Crystal Resonator (Example)
Table 19-2 Damping Resistance Value
Frequency (MHz)
R_d (Ω)
2
4
8
12
16
20
1k
500
200
0
0
0
Crystal Resonator: Figure 19-3 shows the equivalent circuit of the crystal resonator. Use a
crystal resonator that has the characteristics shown in table 19-3 and the same resonance frequency
as the system clock (ø).
XTAL
C_L
L
R_s
EXTAL
C₀
AT-cut parallel-resonance type
Figure 19-3 Crystal Resonator Equivalent Circuit
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