hd64338023s Renesas Electronics Corporation., hd64338023s Datasheet - Page 153

• Manufacturer Part Number: hd64338023s
• Description: Renesas 8-bit Single-chip Microcomputer Super Low Power Series
• Manufacturer: Renesas Electronics Corporation.

4.3
Connecting a 32.768 kHz/38.4 kHz Crystal Oscillator
Clock pulses can be supplied to the subclock divider by connecting a 32.768 kHz/38.4 kHz crystal
oscillator, as shown in figure 4.8. Follow the same precautions as noted under 3. notes on board
design for the system clock in section 4.2.
Note that only operation at 32.768 kHz is guaranteed on the H8/38124 Group.
Figure 4.9 shows the equivalent circuit of the 32.768 kHz/38.4 kHz crystal oscillator.
Pin Connection when Not Using Subclock
When the subclock is not used, connect pin X
4.10.
Figure 4.8 Typical Connection to 32.768 kHz/38.4 kHz Crystal Oscillator (Subclock)
Subclock Generator
Figure 4.9 Equivalent Circuit of 32.768 kHz/38.4 kHz Crystal Oscillator
X
X
X
1
2
1
C
C
1
2
L
S
Frequency
38.4 kHz
32.768 kHz
C = C
C
1
S
1
to GND and leave pin X
2
C
= 15 pF (typ.)
0
Crystal oscillator
Seiko Instruments Inc.
Nihon Denpa Kogyo
Rev. 7.00 Mar 10, 2005 page 111 of 652
C = 1.5 pF typ
R = 14 k
f
W
0
S
= 32.768 kHz/38.4 kHz
R
Section 4 Clock Pulse Generators
S
Ω
typ
2
open, as shown in figure
Products Name
VTC-200
MX73P
REJ09B0042-0700
X
2