Datasheet

Section 20 Flash Memory (0.18-μm F-ZTAT Version)
Rev.6.00 Mar. 18, 2009 Page 791 of 980
REJ09B0050-0600
(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
multiplied or divided clock frequency.
The minimum and maximum values represent the values in MHz, valid to the hundredths place
of MHz, and multiplied by 100. (e.g. when the value is 64 MHz, it will be D'6400 and H'1900.)
• Maximum value (two bytes): Maximum value among the multiplied or divided clock
frequencies.
There are as many pairs of minimum and maximum values as there are operating clock
frequencies.
• SUM (one byte): Checksum