HD6433802H Datasheet, PDF (102/435 Pages) Hitachi Semiconductor – Single-Chip Microcomputer

4.2 System Clock Generator
Clock pulses can be supplied to the system clock divider either by connecting a crystal or ceramic
oscillator, or by providing external clock input.
1. Connecting a crystal oscillator
Figure 4.2 shows a typical method of connecting a crystal oscillator.
C₁
OSC₁
R_f
OSC₂
C₂
R _f = 1 MΩ ±20%
Crystal
Frequency oscillator
4.19 MHz NDK
C₁, C₂
Recommendation
value
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)
RS max (Ω)
C₀ max (pF)
4.193
100
16
84