Renesas H8/38024 Hardware Manual page 140

Pin Connection when Not Using Subclock
When the subclock is not used, connect pin X
4.10.
Figure 4.10 Pin Connection when not Using Subclock
External Clock Input
Connect the external clock to the X1 pin and leave the X2 pin open, as shown in figure 4.11.
Note that no external clock should be input to the H8/38124 Group.
X
1
X
2
Figure 4.11 Pin Connection when Inputting External Clock
Frequency
Duty
Method for Disabling Subclock Oscillator (H8/38124 Group Only)
The subclock oscillator can be disabled by programs by setting the SUBSTP bit in the OSCCR
register to 1. The register setting to disable the subclock oscillator should be made in the active
mode. When restoring operation of the subclock oscillator after it has been disabled using the
OSCCR register, it is necessary to wait for the oscillation stabilization time (typ: 8s) to elapse
before using the subclock.
Rev. 6.00, 08/04, page 110 of 628
to GND and leave pin X
1
X
1
X
2
Open
Subclock (φ φ φ φ w)
45% to 55%
open, as shown in figure
2
GND
Open
External clock input