HD64F3670 Datasheet, PDF (86/305 Pages) Renesas Technology Corp – Hitachi Single-Chip Microcomputer

OSC₁
L_S
C_S
R_S
C₀
OSC₂
Figure 5-3 Equivalent Circuit of Crystal Oscillator
Table 5-1 Crystal Oscillator Parameters
Frequency(MHz)
R_S (max)
C₀ (max)
2
500 Ω
7 pF
4
120 Ω
7 pF
8
80 Ω
7 pF
10
60 Ω
7 pF
16
50 Ω
7 pF
5.1.2 Connecting a Ceramic Oscillator
Figure 5-4 shows a typical method of connecting a ceramic oscillator.
OSC₁
OSC₂
C₁
C₂
C₁ = 30 pF ±10%
C₂ = 30 pF ±10%
Figure 5-4 Typical Connection to Ceramic Oscillator
5.1.3 External Clock Input Method
Connect an external clock signal to pin OSC₁, and leave pin OSC₂ open. Figure 5-5 shows a
typical connection. The duty cycle of the external clock signal must be 45 to 55%.
OSC₁
OSC ₂
Open
External clock input
Figure 5-5 Example of External Clock Input
Rev. 1.0, 03/01, page 62 of 280