H8S2633 Datasheet, PDF (1065/1487 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2600 Series

Section 23B Clock Pulse Generator (H8S/2633R, H8S/2695)
23B.6 Bus Master Clock Selection Circuit
The bus master clock selection circuit selects the system clock (φ) or one of the medium-speed
clocks (φ/2, φ/4, φ/8, φ/16, and φ/32) to be supplied to the bus master, according to the settings of
the SCK2 to SCK0 bits in SCKCR.
23B.7 Subclock Oscillator (This function is not available in the H8S/2695)
(1) Connecting 32.768kHz Quartz Resonator
To supply a clock to the subclock oscillator, connect a 32.768kHz quartz resonator, as shown in
figure 23B.8. See section 23B.3.1, Notes on Board Design for notes on connecting crystal
resonators.
OSC1
OSC2
C₁
C₂
C₁ = C₂ = 15 pF (typ.)
Figure 23B.8 Example Connection of 32.768kHz Crystal Resonator
Figure 23B.9 shows the equivalence circuit for a 32.768kHz resonator.
L_S
C_S
R_S
OSC1
OSC2
C₀
C₀ = 1.5 pF (typ.)
R_S = 14 kΩ (typ.)
f_W = 32.768 kHz
Figure 23B.9 Equivalence Circuit for 32.768kHz Resonator
Rev. 5.00 Mar 28, 2005 page 1003 of 1422
REJ09B0234-0500