HD64336900G Datasheet, PDF (108/408 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Tiny Series

5.5 External Oscillators
This LSI has two methods to supply external clock pulses into it: connecting a crystal or ceramic
resonator, and an external clock. Oscillation pins OSC1 and OSC2 are common with general ports
PC0 and PC1, respectively. To set pins PC0 and PC1 as crystal resonator or external clock input
ports, refer to section 5.3, System Clock Select Operation.
5.5.1 Connecting Crystal Resonator
Figure 5.11 shows an example of connecting a crystal resonator. An AT-cut parallel-resonance
crystal resonator should be used. Figure 5.12 shows the equivalent circuit of a crystal resonator. A
resonator having the characteristics given in table 5.1 should be used.
PC0/OSC1
PC1/OSC2/CLKOUT
C₁
C₂
C₁ = C₂ = 10 to 22 pF
Figure 5.11 Example of Connection to Crystal Resonator
L_S
C_S
R_S
PC0/OSC1
PC1/OSC2/CLKOUT
C₀
Figure 5.12 Equivalent Circuit of Crystal Resonator
Table 5.1 Crystal Resonator Parameters
Frequency (MHz)
RS (Max.)
C0 (Max.)
2
500 Ω
4
120 Ω
8
80 Ω
70 pF
10
60 Ω
Rev. 1.00, 11/03, page 80 of 376