Datasheet

Section 5 Clock Pulse Generator
Rev. 3.00 Sep. 10, 2007 Page 90 of 528
REJ09B0216-0300
5.6 Subclock Oscillator
Figure 5.16 shows a block diagram of the subclock oscillator.
Note : Resistance here is a reference value.
2
1
X
8 MΩ
X
Figure 5.16 Block Diagram of Subclock Oscillator
5.6.1 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 5.17. Figure 5.18 shows the equivalent circuit of the 32.768-kHz
crystal resonator.
X
X
C
1
C
2
1
2
C = C = 15 pF (typ.)
12
Figure 5.17 Typical Connection to 32.768-kHz Crystal Resonator
X
1
X
2
L
S
C
S
C
O
C
O
= 1.5 pF (typ.)
R
S
= 14 kΩ (typ.)
f
W
= 32.768 kHz
R
S
Note: Values here are reference values.
Figure 5.18 Equivalent Circuit of 32.768-kHz Crystal Resonator