HD64F3642AHV Datasheet, PDF (106/551 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 4 Clock Pulse Generators
External Clock Input Method: Connect an external clock signal to pin OSC₁, and leave pin
OSC₂ open. Figure 4.6 shows a typical connection.
OSC ₁
OSC ₂
Open
External clock input
Frequency
Duty cycle
Figure 4.6 External Clock Input (Example)
Oscillator Clock (φOSC)
45% to 55%
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.
C₁
X₁
X₂
C₂
C₁ = C ₂ = 15 pF (typ.)
Figure 4.7 Typical Connection to 32.768-kHz Crystal Resonator
Rev. 6.00 Sep 12, 2006 page 84 of 526
REJ09B0326-0600