Section 4 Clock Pulse Generators
Rev. 7.00 Mar 10, 2005 page 118 of 652
REJ09B0042-0700
For example, if erroneous operation occurs with a wait time setting of 16 states, check the
operation with a wait time setting of 1,024
*
states or more.
If the same kind of erroneous operation occurs after a reset as after a state transition, hold the
RES
pin low for a longer period.
Note: * This figure applies to the H8/38024, H8/38024S, and H8/38024R Groups. The number of
states on the H8/38124 Group is 8,192 or more.
4.5.3 Note on Use of HD64F38024
When using the HD64F38024, the oscillators may not operate if an initial voltage of 10 mV is
applied to the V
CC
pin during power-on. This problem is caused by uncertainty about the state of
the oscillation control signals. It can be corrected by cutting off power and allowing the V
CC
pin
voltage to drop to ground potential before powering-on once again.
4.6 Notes on H8/38124 Group
When using the on-chip emulator, system clock precision is necessary for programming or erasing
the flash memory. However, the on-chip oscillator frequency can vary due to changes in
conditions such as voltage or temperature. Consequently, even if the on-chip oscillator is selected
when using the on-chip emulator, pins OSC1 and OSC2 should be connected to an oscillator, or an
external clock should be supplied. In this case, the LSI uses the on-chip oscillator when user
programs are being executed and the system clock oscillator when programming or erasing flash
memory. The process is controlled by the on-chip emulator.
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