Figure 4.4 Board Design Of Oscillator Circuit; Figure 4.5 External Clock Input (Example) - Renesas H8/3847R Series Hardware Manual

Avoid running signal lines close to the oscillator circuit, since the oscillator may be adversely
affected by induction currents. (See figure 4.4.)
The board should be designed so that the oscillator and load capacitors are located as close as
possible to pins OSC
1
To be avoided
4. External Clock Input Method
Connect an external clock signal to pin OSC
typical connection.
OSC
OSC
Frequency
Duty cycle
Note: The circuit parameters above are recommended by the crystal or ceramic oscillator
manufacturer.
and OSC .
2
Signal A Signal B
C
1
C
2

Figure 4.4 Board Design of Oscillator Circuit

1
Open
2

Figure 4.5 External Clock Input (Example)

Section 4 Clock Pulse Generators
OSC
OSC
, and leave pin OSC
1 2
External clock input
Oscillator Clock (φ φ φ φ
45% to 55%
Rev. 6.00 Aug 04, 2006 page 121 of 680
1
2
open. Figure 4.5 shows a
)
OSC
REJ09B0145-0600