Datasheet

Section 22 Flash Memory
Rev. 3.00 Sep. 28, 2009 Page 737 of 910
REJ09B0350-0300
(f) Operating Clock Frequency Inquiry
The boot program will return the number of operating clock frequencies, and the maximum and
minimum values.
Command H'23
• Command, H'23, (one byte): Inquiry regarding operating clock frequencies
Response H'33 Size Number of operating
clock frequencies
Minimum value of
operating clock frequency
Maximum value of operating clock
frequency
…
SUM
• Response, H'33, (one byte): Response to operating clock frequency inquiry
• Size (one byte): The number of bytes that represents the minimum values, maximum values,
and the number of frequencies.
• Number of operating clock frequencies (one byte): The number of supported operating clock
frequency types
(e.g. when there are two operating clock frequency types, which are the main and peripheral
clocks, the number of types will be H'02.)
• Minimum value of operating clock frequency (two bytes): The minimum value of the divided
clock frequency.
The minimum and maximum values of the operating clock frequency represent the values in
MHz, valid to the hundredths place of MHz, and multiplied by 100. (e.g. when the value is
20.00 MHz, it will be 2000, which is H'07D0.)
• Maximum value (two bytes): Maximum value among the divided clock frequencies.
There are as many pairs of minimum and maximum values as there are operating clock
frequencies.
• SUM (one byte): Checksum