Holtek HT66F30 User Manual page 13

HIRC Trim Operating Procedures:

Connect the e-ICE to a PC, execute IDE3000.exe and start a new operation with Trim
HIRC.

The Configuration Options include setting the operating voltage and the HIRC as the
system frequency using the following steps:
 Set the operating voltage SysVolt according to actual requirements.
 Configure the SysFreq to have the system frequency provided by the internal DEV
or by an external oscillator supplied by the user
 Set V
(for Internal RC selections) according to actual requirements
DD
 Set the Internal RC according to actual requirements
 Configure OSC to have a system frequency to be provided by the internal DEV HIRC
13
e-ICE User's Guide