HD6433640 HITACHI [Hitachi Semiconductor], HD6433640 Datasheet - Page 96

• Manufacturer Part Number: HD6433640
• Description: H8/3644 Series Hardware Manual
• Manufacturer: HITACHI [Hitachi Semiconductor]

4.3
Connecting a 32.768-kHz Crystal Oscillator: Clock pulses can be supplied to the subclock
divider by connecting a 32.768-kHz crystal oscillator, as shown in figure 4.7. Follow the same
precautions as noted under 4.2 Notes on Board Design.
Figure 4.8 shows the equivalent circuit of the 32.768-kHz crystal oscillator.
Pin Connection when Not Using Subclock: When the subclock is not used, connect pin X
V
CC
and leave pin X
X
1
Subclock Generator
Figure 4.7 Typical Connection to 32.768-kHz Crystal Oscillator
Figure 4.8 Equivalent Circuit of 32.768-kHz Crystal Oscillator
2
Figure 4.9 Pin Connection when not Using Subclock
open, as shown in figure 4.9.
L
X
X
S
1
2
C
S
X
X
1
2
C
C
C
0
1
2
C = 1.5 pF (typ.)
R = 14 k
f
Crystal oscillator:
W
0
S
= 32.768 kHz
C = C
R
1
S
V
Open
CC
2
(typ.)
= 15 pF (typ.)
MX38T
(Nihon Denpa Kogyo)
X
2
1
to
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