HD6433832S Datasheet, PDF (101/560 Pages) Renesas Technology Corp – single-chip microcomputers

4.2 System Clock Generator
Clock pulse can be supplied to the system clock divider either by connecting a crystal or ceramic
oscillator, or by providing external clock input.
Connecting a Crystal Oscillator: Figure 4.2 shows a typical method of connecting a crystal
oscillator.
OSC ₁
OSC ₂
C₁
R_f
C₂
R _f = 1 MΩ ±20%
C₁ = C₂ = 12 pF ±20%
Figure 4.2 Typical Connection to Crystal Oscillator
Figure 4.3 shows the equivalent circuit of a crystal oscillator. An oscillator having the
characteristics given in table 4.1 should be used.
OSC₁
C_S
L_S
R_S
OSC₂
C₀
Figure 4.3 Equivalent Circuit of Crystal Oscillator
Table 4.1 Crystal Oscillator Parameters
Frequency (MHz)
R_s (max)
C_o (max)
2
500 Ω
7 pF
4
100 Ω
7 pF
8
50 Ω
7 pF
10
30 Ω
7 pF
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