Subclock Generator - Renesas H8 Series Hardware Manual

Section 4 Clock Pulse Generators
External Clock Input Method: Connect an external clock signal to pin OSC
OSC open. Figure 4.6 shows a typical connection.
2
OSC
OSC
Frequency
Duty cycle
4.3

Subclock Generator

Connecting a 32.768-kHz Crystal Resonator: Clock pulses can be supplied to the subclock
divider by connecting a 32.768-kHz crystal resonator, as shown in figure 4.7. Follow the same
precautions as noted under section 4.2, Notes on Board Design.
Figure 4.7 Typical Connection to 32.768-kHz Crystal Resonator
Rev. 6.00 Sep 12, 2006 page 84 of 526
REJ09B0326-0600
1
Open
2
Figure 4.6 External Clock Input (Example)
Oscillator Clock (φ φ φ φ
45% to 55%
C
1
X
1
X
2
C
2
External clock input
)
OSC
C = C = 15 pF (typ.)
1 2
, and leave pin
1