HD64F3664FPV Datasheet, PDF (110/446 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 5 Clock Pulse Generators
5.2 Subclock Generator
Figure 5.7 shows a block diagram of the subclock generator.
x2
8MΩ
x1
Note : Resistance is a reference value.
Figure 5.7 Block Diagram of Subclock Generator
5.2.1 Connecting 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 5.8. Figure 5.9 shows the equivalent circuit of the 32.768-kHz
crystal resonator.
C₁
X₁
C₂
X₂
C₁ = C₂ = 15 pF (typ.)
Note: Capacitances are reference values.
Figure 5.8 Typical Connection to 32.768-kHz Crystal Resonator
L_S
C_S
R_S
X₁
X₂
C_O
C_O = 1.5 pF (typ.)
R_S = 14 kΩ (typ.)
f_W = 32.768 kHz
Note: Constants are reference values.
Figure 5.9 Equivalent Circuit of 32.768-kHz Crystal Resonator
Rev. 6.00 Mar. 24, 2006 Page 80 of 412
REJ09B0142-0600