HD6432633 Datasheet, PDF (1034/1453 Pages) Renesas Technology Corp – Series of Microcomputers (MCUs: microcomputer units)

23B.6 Bus Master Clock Selection Circuit
The bus master clock selection circuit selects the system clock (ø) or one of the medium-speed
clocks (ø/2, ø/4, ø/8, ø/16, and ø/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=15pF (typ)
Figure 23B-8 Example Connection of 32.768kHz Crystal Resonator
Figure 23B-9 shows the equivalence circuit for a 32.768kHz resonator.
Ls
Cs
Rs
OSC1
OSC2
Co
Co=1.5pF (typ.)
Rs=14kΩ (typ.)
fw=32.768kHz
Figure 23B-9 Equivalence Circuit for 32.768kHz Resonator
980