Renesas H8/38024 Hardware Manual page 136

Connecting a Ceramic Oscillator
Figure 4.5(1) shows a typical method of connecting a ceramic oscillator to the H8/38024 or
H8/38024F-ZTAT Group, and figure 4.5(2) shows a typical method of connecting a crystal
oscillator to the H8/38024S and H8/38124 Group.
OSC
1
OSC
2
Figure 4.5(1) Typical Connection to Ceramic Oscillator
OSC
1
R
f
OSC
2
Ceramic oscillator
Figure 4.5(2) Typical Connection to Ceramic Oscillator
Notes on Board Design
When generating clock pulses by connecting a crystal or ceramic oscillator, pay careful attention
to the following points.
Avoid running signal lines close to the oscillator circuit, since the oscillator may be adversely
affected by induction currents. (See figure 4.6.)
The board should be designed so that the oscillator and load capacitors are located as close as
possible to pins OSC
Rev. 6.00, 08/04, page 106 of 628
C
1
R
f
C
2
(H8/38024, H8/38024F-ZTAT Group)
C
1
= 1 MΩ ±20%
R
f
C
2
Frequency
2.0 MHz
10.0 MHz
16.0 MHz *
Notes: Circuit constants should be determined in consultation
(H8/38024S, H8/38124 Group)
and OSC .
1 2
Ω ±20%
R = 1 M
f
Ceramic
Frequency
oscillator
4.0 MHz Murata
Ceramic
Products name
oscillator
CSTCC2M00G53-B0
Murata
CSTCC2M00G56-B0
CSTLS10M0G53-B0
CSTLS10M0G56-B0
CSTLS16M0X53-B0
with the resonator manufacturer.
* This does not apply to the H8/38024S Group.
C , C
1 2
Recommendation
value
30 pF ±10%
C 1 , C 2
Recommendation
value
15 pF ±20%
47 pF ±20%
15 pF ±20%
47 pF ±20%
15 pF ±20%