Hitachi H8/3637 Hardware Manual page 92

External Clock Input Method: Connect an external clock signal to pin OSC
OSC open. Figure 4.6 shows a typical connection.
2
Frequency
Duty cycle
82
OSC
1
OSC
2
Figure 4.6 External Clock Input (Example)
Oscillator Clock (ø
45% to 55%
External clock input
Open
)
OSC
, and leave pin
1